Tag Archives: bottom paint

How to select marine paint

Ahoy there, fellow seafarers! Are you ready to sail the high seas with style and pizzazz? Selecting the right marine paint is critical to the appearance, longevity, and performance of a boat. Marine paint not only adds an aesthetic appeal to the boat but also protects the hull from environmental elements such as water, sunlight, and salt. It can also help reduce the drag and improve fuel efficiency of the boat.

When choosing marine paint, there are several factors to consider such as the type of paint, the water conditions in which the boat will be used, the type of hull material, the application method, and the expected maintenance. These factors can affect the durability and effectiveness of the paint, as well as the overall appearance of the boat. So, don’t be like a sailor who forgot to batten down the hatches – take the time to select the right boat paint. Your boat (and your reputation as a savvy boater) will thank you.

KEY TAKEAWAYS

Choosing the right marine paint is important for both the appearance and protection of your vessel.

There are different types of marine paints, such as antifouling paint, topside paint, and bottom paint, each with its own purpose and application.

When selecting marine paint, it’s important to consider factors such as water conditions, hull material, and application method.

Proper application of marine paint is crucial for achieving a smooth, even finish and ensuring the paint lasts as long as possible.

Maintaining your boat paint with regular cleaning and touch-ups can help preserve the value of your vessel and keep it looking great.

Types of marine paints

There are several types of marine paints available in the market, each designed for a specific purpose. Here are some of the most common types of boat paints:

Antifouling paint – Antifouling paint is designed to protect the hull of the boat from the growth of marine organisms, such as algae and barnacles. It contains biocides that inhibit the growth of these organisms, preventing them from attaching to the hull. Antifouling paint is best used in saltwater or brackish water environments.

Topside paint – Topside paint is used to protect the upper part of the boat above the waterline. It can be used on the deck, cabin, and other areas exposed to sunlight and harsh weather conditions. Topside paint comes in a variety of finishes, from matte to glossy, and can be customized to match the desired look of the boat.

Bottom paint – Bottom paint is designed to protect the hull of the boat below the waterline. It prevents the growth of marine organisms, such as barnacles and mussels, which can cause drag and reduce the boat’s performance. Bottom paint is best used in saltwater or freshwater environments.

Epoxy paint – Epoxy paint is a two-part paint system that is highly durable and resistant to water, chemicals, and abrasion. It is commonly used as a primer or barrier coat to protect the hull from moisture and corrosion. Epoxy paint can also be used as a topcoat for added protection and a glossy finish.

Varnish – Varnish is a clear, protective coating used to enhance the natural beauty of wood on the boat. It provides UV protection, moisture resistance, and durability to the wood, making it last longer and maintain its appearance.

The type of marine paint to use depends on the intended use of the boat and the environmental conditions in which it will be used. For example, antifouling paint* is best used in saltwater environments to prevent marine growth, while topside paint can be used to enhance the boat’s appearance and protect it from UV rays. Bottom paint is ideal for boats that spend a lot of time in the water, while varnish is suitable for boats with wooden surfaces that need protection and a glossy finish.

Factors to consider when selecting marine paint

When selecting the right marine paint, there are several factors that should be taken into account. Here are some of the most important factors to consider:

Water conditions – The type of water in which the boat will be used is a critical factor to consider when choosing boat paint. Saltwater, freshwater, and brackish water each have different environmental conditions that can affect the performance and durability of the paint. Saltwater, for example, can be corrosive and requires a more durable paint that can withstand the harsh environment.

Hull material – The material of the boat’s hull is another important factor to consider when selecting boat paint. Different types of paint are designed to adhere to specific materials, such as fiberglass, aluminum, or wood. It’s important to choose a paint that is compatible with the hull material to ensure proper adhesion and maximum protection.

Application method – The application method of the paint can also affect the final appearance and performance of the paint. Some types of paint, such as epoxy paint, require a specific application method, while others, such as topside paint, can be applied using a brush, roller, or spray. It’s important to choose a paint that can be applied using the desired method and to follow the manufacturer’s instructions for the best results.

Expected maintenance – The expected maintenance of the boat paint is another factor to consider when selecting boat paint. Some types of paint, such as antifouling paint**, require more frequent maintenance, such as cleaning and touch-ups, to maintain their effectiveness. It’s important to choose a paint that fits your maintenance schedule and skill level.

Tips for evaluating these factors and making an informed decision

Consult with a professional or a trusted boat maintenance expert, such as Bottom Paint Store, to help you evaluate the different factors and choose the right boat paint for your needs. offers free technical assistance.

Research different brands and types of marine paint to compare their performance, durability, and cost-effectiveness.

Check the manufacturer’s recommendations and application instructions to ensure compatibility with your boat’s hull material and the intended application method.

Consider the expected lifespan of the paint and the frequency of maintenance required to ensure the paint remains effective.

Finally, remember that selecting the right marine paint is an investment in the long-term performance and appearance of your boat, so take the time to make an informed decision.

Applying marine paint

Properly applying marine paint is crucial to achieving a smooth, durable finish that protects your boat from the harsh marine environment. Here’s why it’s important and how to do it:

A proper application ensures the paint adheres to the surface and forms a protective barrier against the elements.

Applying paint unevenly or too thinly can result in a weak bond that can crack, peel, or fade prematurely.

Proper application also ensures the paint dries evenly and maintains its color and gloss for longer.

Step-by-step instructions for applying marine paint

Surface Preparation: Before applying any paint, clean the surface thoroughly to remove any dirt, grease, or other contaminants. Sand the surface to create a rough texture that promotes adhesion.

Primer: Apply a primer to the surface to promote adhesion and provide a smooth base for the paint. Allow the primer to dry completely before applying the paint.

Application: Apply the paint using a brush, roller, or spray gun, depending on the type of paint and the desired finish. Apply the paint in thin, even coats, and avoid overloading the brush or roller.

Drying: Allow each coat to dry completely before applying the next coat. Follow the manufacturer’s instructions for the recommended drying time between coats.

Sanding: Sand the surface lightly between coats to create a smooth texture and promote adhesion.

Final Coat: Apply the final coat of paint using the same technique as the previous coats. Allow the final coat to dry completely before using the boat.

Tips for achieving a smooth, even finish:

Use high-quality paint and tools to achieve a professional-looking finish.

Apply the paint in thin, even coats to prevent runs and drips.

Avoid painting in direct sunlight or high humidity to prevent the paint from drying too quickly or not drying properly.

Follow the manufacturer’s instructions for the recommended number of coats and drying time between coats.

Sand the surface lightly between coats to create a smooth texture and promote adhesion.

Use a high-quality brush or roller to ensure the paint goes on evenly.

Keep the paint mixed well to maintain consistency throughout the application process.

Maintaining marine paint

Properly applying marine paint is crucial to achieving a smooth, durable finish that protects your boat from the harsh marine environment. A proper application ensures the paint adheres to the surface and forms a protective barrier against the elements. Applying paint unevenly or too thinly can result in a weak bond that can crack, peel, or fade prematurely. It also ensures the paint dries evenly and maintains its color and gloss for longer.

Where to buy marine paint

In summary, choosing the right marine paint is essential for protecting your vessel from the harsh marine environment and ensuring it looks its best. Factors like water conditions, hull material, and application method should all be taken into account when selecting the right paint for your boat. Once you’ve chosen the right paint, be sure to apply it properly to achieve a smooth, even finish. And remember, a well-maintained paint job not only looks great but can also help preserve the value of your boat.

So, don’t be like a bad paint job – sloppy, uneven, and ultimately disappointing. Take the time to select the right paint and apply it properly. Your boat (and your wallet) will thank you. Bottom Paint Store has a huge selection of marine paint at discounted prices and if you need technical assistance, feel free to contact us Monday to Friday 9am-5pm EST 888.505.2313.

Source:

*Wikipedia Anti-fouling paint

** Marine fouling and its prevention ; prepared for Bureau of Ships, Navy Dept.

How to choose the right bottom paint for my boat

Are you ready to dive deep into the world of boat bottom paint? Well then, you’ve come to the right place! We’re going to cover everything you need to know about choosing the right bottom paint for your boat.

If you’ve owned a boat for any length of time you know, bottom paint is an essential component of boat maintenance, particularly for boats that are kept in the water for extended periods. It’s crucial because the bottom of a boat is exposed to harsh elements such as saltwater, algae, and other marine organisms, which can cause damage and reduce the performance of the vessel. Applying a high-quality bottom paint to the hull of the boat can help protect it from these elements, preventing the growth of algae and other marine organisms, reducing drag, and improving the boat’s overall performance. Bottom paint also helps prevent corrosion and other types of damage to the hull, which can ultimately extend the lifespan of the boat. By investing in quality bottom paint and regularly maintaining it, boat owners can ensure that their vessel remains in good condition and performs at its best for years to come.

KEY TAKEAWAYS

Choose a bottom paint that is suitable for the type of water and conditions in which your boat will be used.
Consider the type of hull material your boat has, as some paints may not be compatible with certain materials.
Choose the appropriate type of bottom paint based on the level of fouling in your area and the type of marine life that is present.
Select a paint that is compatible with any existing coatings on your boat’s hull.
Consider the application method and how easy it will be to apply and maintain the paint.
Make sure to properly prepare the surface before applying the bottom paint to ensure optimal performance.
Follow the manufacturer’s instructions for application, drying times, and maintenance to maximize the lifespan of the bottom paint.

The Different types of bottom paints available

There are several different types of bottom paints available for boats, each with its own unique properties and benefits. Here are some of the most common types of bottom paint:

Hard bottom paint – This type of paint is designed for boats that are used frequently and require a durable, long-lasting paint that can withstand abrasion and harsh marine environments.

Soft bottom paint – Soft bottom paints are ideal for boats that are stored on land for extended periods and are less frequently used. These paints offer excellent antifouling protection, but they may require more frequent reapplication.

Ablative bottom paint – This type of paint is formulated to wear away slowly over time, gradually releasing biocides to prevent fouling. Ablative bottom paints are ideal for boats that are used frequently and require continuous antifouling protection.

Copper-free bottom paint – Copper-free bottom paints are becoming increasingly popular due to concerns about the environmental impact of copper on marine ecosystems. These paints use alternative antifouling agents, such as zinc or biocides, to prevent fouling.

Hybrid bottom paint – Hybrid bottom paints combine the benefits of multiple types of bottom paints, offering excellent antifouling protection, durability, and environmental safety. These paints are a great option for boaters who want the best of all worlds.

When choosing a bottom paint, it’s essential to consider factors such as the boat’s usage patterns, the type of water the boat will be used in, and environmental regulations governing antifouling agents. It’s also important to choose a paint that is compatible with your boat’s existing paint and surface preparation.

What are the factors to consider when choosing bottom paint?

There are several factors to consider. Here are some of the most important ones:

Boat usage: The type of bottom paint you choose will depend largely on how often you use your boat and the type of water you’ll be operating in. Boats that are used frequently and kept in the water year-round may require a different type of paint than those that are only used seasonally or kept on land.

Hull material: The type of material your boat’s hull is made from can affect the type of bottom paint you can use. For example, some types of bottom paint may not be compatible with certain hull materials, such as aluminum or fiberglass.

Water conditions: The type of water you’ll be operating in can also affect the type of bottom paint you need. For example, boats operating in saltwater may require a different type of paint than those operating in freshwater.

Antifouling properties: Antifouling properties are an essential consideration when choosing bottom paint. The paint you choose should be effective at preventing fouling and protecting your boat from marine organisms.

Environmental regulations: Many areas have regulations governing the use of certain types of bottom paints due to their potential impact on the environment. Before choosing a bottom paint, be sure to check local regulations to ensure you’re using a product that’s allowed in your area.

Compatibility with existing paint: It’s important to choose a bottom paint that’s compatible with your boat’s existing paint and surface preparation. Using an incompatible paint can lead to adhesion issues and other problems.

Personal preference and budget are also important factors to consider when choosing bottom paint for your boat.

When it comes to personal preference, you may have a particular type or brand of bottom paint that you prefer based on past experience or recommendations from other boaters. It’s important to choose a product that you feel comfortable using and that meets your specific needs.

Budget is also an important consideration. Bottom paint can range in price depending on the type, brand, and quality of the product. While it may be tempting to choose a cheaper option to save money, it’s important to remember that high-quality bottom paint is an investment in the long-term health and performance of your boat. In the end, choosing a quality product may actually save you money in the long run by reducing the need for frequent repainting and repairs.

It’s important to weigh these factors against the other considerations mentioned earlier, such as boat usage, water conditions, and environmental regulations. By finding a balance between these various factors, you can choose a bottom paint that meets your needs while staying within your budget.

In addition to these basic types, there are also specialized bottom paints that are designed for specific conditions, such as warm water or extreme fouling. It’s important to choose a bottom paint that’s appropriate for your specific needs and usage patterns, and to consider factors such as your boat’s hull material, water conditions, and local environmental regulations when making your selection.

What is the paint application process?

The application process for bottom paint can vary depending on the type of paint you choose, but generally, it will involve surface preparation, choosing the right application method, and applying the paint. Here’s a breakdown of the steps involved:

Surface Preparation:

Proper surface preparation is critical to ensuring that the bottom paint adheres well and provides effective protection against fouling. Before applying the paint, you’ll need to clean and prepare the hull surface by removing any old paint, dirt, oil, or other contaminants. This may involve sanding, scraping, or pressure washing, depending on the condition of the surface.

Choosing the Right Application Method:

There are several different methods for applying bottom paint, including brush, roller, and spray. The method you choose will depend on the type of paint you’re using, the size and shape of your boat, and your personal preference. Some types of bottom paint may require a specific application method, so be sure to read the manufacturer’s instructions carefully.

Applying the Bottom Paint:

Once the surface is clean and prepared, and you’ve chosen the right application method, it’s time to apply the paint. Be sure to follow the manufacturer’s instructions carefully, and apply the paint evenly and smoothly. Depending on the type of paint you’re using, you may need to apply multiple coats to achieve the desired level of protection. Be sure to allow each coat to dry thoroughly before applying the next.

After the paint has been applied, be sure to clean up any tools or equipment and dispose of any leftover paint or solvents in accordance with local regulations. Proper disposal is important to protect the environment and prevent pollution.

The application process involves proper surface preparation, choosing the right application method, and applying the paint according to the manufacturer’s instructions. By following these steps carefully, you can ensure that your boat’s bottom paint provides effective protection against fouling and extends the life of your vessel.

How do I know how many coats of bottom of bottom paint to apply?

The number of coats of bottom paint you should apply can depend on the type of paint you’re using, as well as the manufacturer’s recommendations. Generally, bottom paint manufacturers will specify the recommended number of coats on the product label or in the application instructions.

In most cases, two coats of bottom paint are recommended for optimal performance and protection. However, some paints may require more or fewer coats, so it’s important to consult the manufacturer’s instructions for guidance.

Factors such as the condition of your boat’s hull and the type of water and marine life in your area can also impact the number of coats of bottom paint needed for adequate protection.

It’s important to note that applying too many coats of bottom paint can actually be counterproductive and lead to issues such as cracking or peeling. Therefore, it’s best to follow the manufacturer’s instructions and apply the recommended number of coats for the specific paint you’re using.

Maintenance and Repainting

Maintaining your boat’s bottom paint is essential to ensure that it continues to provide effective antifouling protection and prolong the life of your vessel. Here are some tips for maintaining your boat’s bottom paint:

Regular Cleaning: Regularly cleaning your boat’s hull will help to remove any dirt, grime, or debris that can build up on the surface and reduce the effectiveness of the bottom paint. Use a soft-bristled brush or a pressure washer to gently clean the hull, being careful not to damage the paint.

Inspect the Paint: Regularly inspecting your boat’s bottom paint can help you to catch any problems early on and prevent them from becoming more serious. Look for signs of chalking, cracking, or peeling, which can indicate that the paint is no longer providing effective protection.

Address Any Problems Promptly: If you notice any problems with your boat’s bottom paint, such as chalking, cracking, or peeling, it’s important to address them promptly. This may involve sanding, scraping, or repainting the affected areas to restore the protective coating.

Repaint as Needed: Over time, all bottom paints will wear away and lose their effectiveness. Depending on the type of paint you’re using and the conditions in which you use your boat, you may need to repaint every 1-3 years to maintain effective antifouling protection.

When it comes time to repaint your boat’s bottom, the process will be similar to the initial application process. You’ll need to prepare the surface by cleaning and sanding the hull, choose the appropriate type of paint, and apply it according to the manufacturer’s instructions. It’s important to choose a high-quality paint and to follow proper application techniques to ensure that your boat’s bottom paint continues to provide effective protection for years to come.

How do I know when it’s time to repaint bottom paint?

Knowing when to repaint your boat’s bottom paint can depend on several factors, such as the type of paint used, the conditions in which your boat is used, and the level of fouling on the hull. Here are some general signs that it may be time to repaint your boat’s bottom paint:

It has been several years since the last application: Most bottom paints have a lifespan of around 2-3 years, after which they will begin to lose their effectiveness.

The paint is visibly worn or peeling: If you can see patches of bare hull or the paint is peeling, it’s a good indication that it’s time to repaint.

Increased fouling: If you notice an increase in fouling, such as barnacles or algae, on your boat’s hull, it may be time to repaint with a more effective antifouling paint.

Reduced performance: If your boat is slower than usual or handling differently, it may be due to a buildup of fouling or worn-out bottom paint.

Inspection reveals wear or damage: During routine maintenance, if you notice any wear, scratches, or damage to the bottom paint, it may be time to repaint to prevent further damage.

It’s important to note that regular maintenance and cleaning can extend the lifespan of your bottom paint and help you catch any issues before they become too severe. If you are unsure whether it’s time to repaint your boat’s bottom paint, consult with a marine professional or bottom paint manufacturer for guidance.

Where can I buy bottom paint?

You can buy bottom paint at Bottom Paint Store, an online store that specializes in selling premium marine paints, gel coat, varnish, and supplies.

When shopping at a bottom paint store, you will find a wide variety of bottom paint, including antifouling paints, ablative paints, hard paints, and more. These paints come in different colors, sizes, and formulations to meet the needs of different types of vessels and boating conditions.

Alright, we’ve covered a lot. So, to wrap things up, choosing the right bottom paint for your boat is crucial to keeping your vessel in tip-top shape. You want to make sure you pick a paint that’s suited for your boat’s specific needs and the conditions it’ll be facing. You also want to make sure you follow the manufacturer’s instructions for application and maintenance, so you get the most bang for your buck. Remember, keeping your boat’s bottom clean and protected not only helps it perform better on the water, it also helps you avoid costly repairs down the line!

How to Identify the Type of Paint on My Boat

Our customer service team often receives phone calls from customers asking how to identify the type of paint on my boat? The paint label should indicate the type of paint it is, as well as any other information about the paint. However, that may not be available.

In this case, you will need to know the surface of your vessel, for example is it aluminum, wood or fiberglass?

Once you have identified the surface, the type of boat paint can be narrowed down.

If you are looking at the topside area of a boat, and the surface has a gloss/shiny finish, the options are mainly Gelcoat or marine paint.

To tell these apart, you can use a couple of methods:

One method is to use rubbing alcohol on a white cloth and rub it over an inconspicuous area of the hull. If the surface starts to shine, then it’s likely that you have Gelcoat. Another option is to take a piece of sandpaper and gently rub it over an area where the finish appears smooth. If the paper doesn’t snag and pull up any fibers from the surface, then it’s most likely Gelcoat as well.

If you are looking at the bottom of the boat, and the surface has a dull, flat sheen finish you most likely have some type of antifouling bottom paint. The two most popular bottom paints are self-polishing ablative and hard bottom paint.

The self-polishing ablative bottom paints work like a bar of soap, once the boat moves in the water or there is a current and or tide, the outer layer slowly wears away. It is easy to tell when a boat is painted with ablative bottom paint, simply rub it with a dry rag in an inconspicuous area of the hull. If the paint easily rubs off, you most likely have a self-polishing ablative bottom paint.

Note: compatibility within bottom paints can be tricky, we recommend checking the compatibility chart of the new bottom paint you are interested in applying, to ensure you prepare the surface correctly.

Here are the bottom paint compatibility and cross-references charts by bottom paint manufacturer:

It is important to determine the age of the paint. Again, you can look at the label on the can of paint for a date or call the source you ordered from to see if they have a record of your order. Bottom Paint Store has order records that span several years.

The final step is to evaluate the condition of the paint. If the paint is peeling, flaking, or otherwise showing signs of wear, it will need to be replaced. However, if the paint is in good condition and there are no visible signs of wear, you may be able to simply touch up any areas that are damaged.

How do I know if my boat has Gelcoat on it or paint?
How to Apply Bottom Paint Over Existing Bottom Paint

Using a Signal Coat Indicator for Repainting Ablative Antifouling Paint

Antifouling paint is a type of underwater hull paint, also known as bottom paint. These specialized coatings are designed for the exterior of the hull of a ship or boat and combat the growth, as wells as, the detachment of underwater organisms, such as seaweed, algae, and barnacles. These aquatic life forms bind to the hull and impact a vessel’s performance and longevity.

Anti-fouling paints are often applied as one component of a multi-layering process which can have other benefits in addition to their antifouling properties, such as acting as a barrier against corrosion on metal hulls that will degrade and weaken the metal, or improving the flow of water past the hull of a boat or yacht.

Boaters recognized early on it is important to keep the bottom of their craft free of barnacles due to loss of speed and performance. The key is knowing when to pull your boat out of the water for a new bottom paint application. Ablative paints are typically reapplied every 1–3 years. One way to ensure you reapply your ablative antifouling paint when it’s needed is by adding a signal coat or flag coat.

To apply a signal/flag coat, when you are getting multiple coats of ablative bottom paint applied to your hull, make the first coat a different color. For example, if the bottom is going to be painted blue, make the first coat red. When the blue paint wears off and you see the red flag coat, it is time to repaint.

If you need further assistance with your boat painting project feel free to contact our technical team Monday-Friday 8:30-5:00 pm EST.

What Equipment is Needed to do a Proper Application of Antifouling Bottom Paint?

Antifouling bottom paint is needed if you store your boat in the water. If left in the water without protection, marine growth may attach to your boat’s exposed hull. Marine growth slows a boat down and increases fuel consumption. Here are the items that you will need in addition to the bottom paint for the proper anti-fouling bottom paint application.

• 60–100 grit – Suitable for the removal of paint or to sand gel coat prior to the application of antifouling paint.
• After sanding remove sanding residue by wiping with a cloth that has been dampened with the proper solvent.
• Masking Tape – When it is necessary to mask off areas use a high quality clean edge masking tape, especially when the masking tape will be left on the surface for a long time.
• Brushes – For antifouling paints use a natural bristle brush but not necessarily one of as good quality as you would use to apply topside finishes.
• Rollers – Most solvent resistant rollers will have a phenolic core and will say that they are for use with oil based paints or epoxies. For antifouling paint and epoxy primers, use a 3/8”-1/2” nap roller.

Which Bottom Paint is Best for Freshwater Lakes?

algae Most Antifouling Bottom Paint is marketed toward the harsh conditions of the Caribbean. But which Antifouling Bottom Paint will work best in Freshwater Lakes?

The short answer is this: Antifouling Bottom Paint that works well in the harsh conditions of the Caribbean will be more than enough protection for boats in freshwater lakes. The real trick is choosing the paint that will fit your situation the best. Choosing a bottom paint with more biocide (usually cuprous oxide) will be more potent and fight off growth more successfully. Sometimes you don’t need to purchase the strongest and the greatest. A paint with just the right amount of biocide will do nicely and can also save a few bucks.

Here are some basic guidelines to help you decide which paint is best for your boat.

boat-trailer-360 If the boat comes out of the water periodically, such as on a lift or trailer, Ablative Bottom Paint is the correct choice. When in fresh water, slime and algae tend to be the most concerning. Sea Hawk’s AF-33 or Talon and Blue Water Marine’s Copper Shield 25 perform really well with these conditions, especially with the manufacturers boosters added, see below.

If the boat never comes out of the water except to be repainted, a Hard Epoxy Bottom Paint will keep away the algae. Sea Hawk Sharkskin is a mid strength Hard Bottom Paint that fits a tighter budget.

What about Bottom Paint Additives?

Sea Hawk bottom paint produces a paint additive called Bio Cop TF to help fight against algae and soft growth. This product will boost the effectiveness of your paint’s ability to keep the hull free of growth. **NOTE: Biocop TF Pint may only be used as a bottom paint additive in the following products: AF-33, Cukote, Sharkskin, Talon, and Tropikote. A booster has restrictions to paint added to and you should stick with the same manufacturer.

If you still aren’t sure what is needed for your boat, check out these other How To Articles:

Do I Need Bottom Paint on My Boat?

What is the Best Paint for My Boat?

Choosing the Right Boat Paint

How to Apply Bottom Paint Over Existing Bottom Paint

Do I Need Bottom Paint on My Boat?

Most of the time when bottom paint is considered on a boat it is Antifouling paint. Bottom paint blocks growth of organisms that attach to the hull and can impact a vessels speed, performance, and durability when the boat is stored in water for extended periods of time. Antifouling bottom paint usually has a flat, dull finish that is used below the waterline. If you don’t have this challenge, you may not need bottom paint.

If you don’t have a growth problem or would like a nice shine to your boat’s bottom look to our other items like gelcoat or a topside paint for moderate water exposure or an aluminum paint with no antifouling agents. Gelcoat adheres to most gelcoats or fiberglass/resins, see how to apply gelcoat. A boat bottom with antifouling will need to have it removed via sanding, sandblasting or bottom paint remover before a different type of paint will adhere.

There are generally two types of bottom paint both of which have several variations that create a multitude of products in the market place. The two different types or categories of bottom paint include hard bottom paint and ablative bottom paint.

Hard Bottom Paint vs. Ablative Bottom Paint

Hard bottom paint is bottom paint that is a hard modified epoxy. After you apply hard bottom paint it is very durable and does not wear off. Hard bottom paints typically have a higher ratio of pesticides (usually copper) in them that are exposed in the outer surface of the bottom paint coating. As time goes by, the coating oxidizes and becomes less effective in combating marine growth. Hard bottom paint is generally used on boats when the boat sits for long periods of time without moving at all, or there is little movement of water (current/ tide) around the boat. You should not use a hard paint if you boat comes out of the water such as on a trailer or a lift. After 72 hours, the hard bottom paint will oxidize on the outer surface from the air and becomes ineffective. If you are trailering your boat, or keep it on a lift you should always use ablative bottom paint.

Ablative bottom paint, also known as self- polishing bottom paint, is softer and allows the coating to wear off at a controlled rate. Much like a bar of soap, once the boat moves in the water or there is a current and or tide, the outer layer slowly wears away. The wearing away of the self-polishing bottom paint allows for new, unoxidized paint to be exposed. Therefore, if you are trailering your boat, or it comes in and out of the water for any reason, the paint will oxidize within 72 hours. However, once placed back in service, that oxidized ablative paint wears away and exposes a new fresh outer coating with active protection. Ablative bottom paint is a newer technology then hard paint. It is the preferred bottom paint of most users since it typically lasts longer and continuously exposes a new active outer coating that protects against marine growth.

How long does bottom paint last on a boat?

In general, you should apply boat bottom paint once a year, however; some bottom paints can last for two years. If your boat is kept in the water or you use it regularly, you you have it checked annually to determine if it requires a new bottom paint coating.

For more how to use details see How to apply bottom paint to bare fiberglass or How to apply bottom paint over existing bottom paint.

How much does it cost to bottom paint a boat?

The cost to paint the bottom of your boat depends on a number of factors including the size of your boat, the paint you choose and whether you use a primer or not. Other factors include whether you will paint your boat or hire someone to paint it. For example, Biocop TF by Sea Hawk, is a popular bottom paint and currently costs $275.77 a gallon and provides theoretical coverage of 315 square feet per gallon. If the bottom surface of your boat is 700 square feet you would theoretically need to purchase three gallons (Biocop is not offered in quarts) at a total cost of $827. 31 for the three gallons.

That may seem expensive for paint, however boat bottom paint uses antifouling properties in order to protect the boat’s bottom from organisms found in saltwater and other elements.

For information on calculating how much paint you need to paint your boat bottom you can refer to our Bottom Paint Calculator.

What is the Best Bottom Paint Money Can Buy?

Best Performing Bottom Paint

The best bottom paint that money can buy may NOT be the most expensive. You should buy the bottom paint that works best in your area. That will depend on the temperature of the water, tide changes, the nutrients in the water that feed unwanted growth, and many other factors.

The best bottom paint for you will be the bottom paint that stops the growth and does not break your wallet. If you buy the best performing bottom for the harshest fouling conditions and the warmest waters you would need Sea Hawk Paints Biocop TF or another Top Performing Bottom Paint. This provides you the absolute maximum protection against hard and soft growth on the bottom of your boat. This solution is recommended for high growth areas, or if you are trying to goes as long as you possibly can between bottom jobs. If you are in cooler climates or lower fouling conditions you would NOT need to spend the extra money on Sea Hawk Biocop TF. A better choice that is less expensive and will work in these conditions is Sea Hawk AF-33 or the equivalent.

ALUMINUM BOATS: The best bottom paint for an aluminum boat or pontoons is a copper free bottom paint. You cannot put the paints mentioned above (Copper-Based) on aluminum because they contain copper and will react like a battery causing pitting (holes) on aluminum. Therefore, we recommend an Aluminum Safe Bottom Paint. A good choice for aluminum is Sea Hawk Colorkote, it is copper free triple biocide paint safe for aluminum. If the aluminum has never been painted the best practice is to prime with high build epoxy primer like Sea Hawk Tuff Stuff to insure good adhesion and protect against corrosion. If you are painting a pontoon boat for the first time – try our Pontoon Bottom Paint Kit.

The best bottom paint for the outdrives is to brush on Smart Solution. (pint size). If your outdrive has never been painted before, you can use Barnacle Blocker Primer for priming the area application of bottom paint. A great value for this is the Premium Outdrive Bottom Paint Kit. If there is already a bottom paint on your running gear, just scuff sand and paint! Another option is to try an aerosol spray bottom paint. These are easy to apply.

For outdrives a foul release agent may be the choice for you, see here.

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