Category Archives: Polyurethane Paint, Coatings, Foam

applying polyurethane foam

Step-by-Step Guide to Applying Polyurethane Foam

In this guide we’ll delve into the step-by-step process of applying polyurethane foam, a versatile material widely used for insulation, waterproofing, and structural support in various industries. We’ll walk you through everything from prepping your workspace to achieving a satisfyingly smooth finish. Whether you’re a DIY enthusiast or a professional contractor, this guide will assist you with the knowledge and techniques to use polyurethane foam in your projects.

Materials Needed:

  • Polyurethane foam kit (includes base and activator)
  • Mixing container
  • Stirring stick or mechanical mixer
  • Protective gear (gloves, goggles, respirator)
  • Clean cloth
  • Scale (if required)

Step 1: Preparation

Before you begin, ensure that the workspace is well-ventilated and free from any dust or debris. Clean all surfaces that will come into contact with the foam. Wear appropriate protective gear to prevent skin and eye contact with the materials.

Step 2: Measuring Measure the components accurately. For most foam applications, a 1:1 ratio by volume of base and activator is required, but always check the manufacturer’s instructions. For precise projects, measuring by weight may be necessary, so use a scale to ensure accuracy.

Step 3: Mixing In a clean container, combine the base and activator. Use a stirring stick to mix thoroughly for about 3-5 minutes. If available, a mechanical mixer can be used at a low to medium speed to ensure a consistent mix without introducing too much air into the foam.

Step 4: Application Immediately after mixing, pour the foam into the prepared area. Be aware that the foam will start to expand and cure quickly. Pour from a corner or one side to the other to minimize air pockets and ensure even coverage.

Step 5: Curing Allow the foam to expand and cure. The time needed can vary depending on the foam density and environmental conditions like temperature and humidity. Typically, the foam becomes tack-free in several minutes and fully cured within hours. Avoid disturbing the foam during curing.

Step 6: Clean-up After application, clean your tools and mixing containers with acetone or another suitable solvent before the foam cures. Cured foam is very difficult to remove.

Step 7: Finishing Touches Once cured, inspect the foam for any voids or uneven areas. Additional foam can be applied to fill gaps. Once fully cured, the foam can be cut, sanded, or painted as required.

Safety Tips:

  • Always work in a well-ventilated area to avoid inhalation of fumes.
  • Wear protective clothing, including gloves and goggles, to avoid skin and eye contact.
  • Read and follow all safety instructions provided with your foam kit.

This method is ideal for a range of applications from marine flotation to insulation projects. Each kit may have specific instructions, especially regarding the ratio of components and curing times, so referring to the product’s manual is critical.

For detailed product information and specific usage instructions, you can check the guide available on the Bottom Paint Store website.


a guide for selecting the right boat 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.


  • 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.


*Wikipedia Anti-fouling paint

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

Liquid Urethane Uses and Differences in Density

When most people hear the term “Liquid Urethane,” they think of a thick, black substance used for coating surfaces. While this is correct, Liquid Urethane comes in many varieties with different purposes. For example, some Liquid Urethanes are designed to be applied very thin while others are much thicker. Additionally, there are variations in terms of density – some liquids are denser than others – which affects how they should be used. In this blog post, we will look at what Liquid Urethane is, what its various uses are, and how density affects its application.

What is liquid urethane and what are its uses

Urethane is a liquid polymer that has a wide variety of uses. It is used in the production of plastics, coatings, adhesives, and sealants. Liquid urethane is also used as an insulation material and as a filler for composite materials. In addition, liquid urethane can be used to create dental implants and prosthetic devices.

How is liquid urethane density measured?

To measure the density of liquid urethane, you’ll need a graduated cylinder and a weight scale. First, weigh the graduated cylinder on the scale to get an empty weight. Then, fill the cylinder with liquid urethane and weigh it again. Subtracting the empty weight from the full weight will give you the total weight of liquid urethane in the cylinder. To calculate the density, simply divide this weight by the volume of liquid urethane in the cylinder. This will give you a density measurement in grams per cubic centimeters (g/cc).

The density of liquid urethane is measured in a variety of ways, depending on the intended use of the urethane. For example, the weight per gallon is often used to calculate the costs of shipping and handling. The pound per cubic foot is also used to calculate the volume of urethane needed for a given job. In both cases, the density of liquid urethane is calculated by dividing the weight of the urethane by its volume.

What factors affect the density of liquid urethane

The density of liquid urethane can be affected by a variety of factors, including its composition, temperature, and pressure. Urethane is a polymer that can be made from a variety of monomers, or small molecules. The type of monomer used will affect the urethane’s density. For example, using a heavier monomer will result in a denser urethane. Temperature can also affect the density of liquid urethane; as temperature increases, the urethane will expand and become less dense. Finally, liquid urethane is usually stored under pressure to keep it from expanding. If the pressure is too high, the liquid urethane can become dense and difficult to work with. By understanding these factors, it is possible to control the density of liquid urethane and choose the right product for your needs.

There are many factors that can affect the density of liquid urethane. The first is the temperature of the liquid urethane. The colder the liquid urethane, the denser it will be. The second factor is the pressure of the liquid urethane. The higher the pressure, the denser the liquid urethane will be. The third factor is the type of liquid urethane. Some types of liquid urethane are denser than others. The fourth factor is the amount of liquid urethane. The more liquid urethane there is, the denser it will be. Finally, the fifth factor is the presence of impurities in the liquid urethane. If there are impurities present, they can make the liquid urethane denser.

Examples of where to use liquid urethane with different densities

There are many different uses for liquid urethane. The material can be used as a sealant, adhesive, or even a casting material. When choosing a liquid urethane, it is important to consider the density of the material. A high-density urethane may be better suited for a heavy-duty application, while a low-density urethane may be more suitable for a lightweight application.

Here are some examples of where to use liquid urethane with different densities:

  • Use a high-density urethane as an adhesive for bonding metal to concrete.
  • Use a low-density urethane as a sealant for gaps and cracks around doors and windows.
  • Use a medium-density urethane as a casting material for creating prototypes or models.
    No matter what the application, liquid urethane can be a versatile and durable solution. By carefully selecting the right density for the job, it is possible to achieve excellent results.

How to select the right liquid urethane for your needs

How do you know which one is right for your project? Here are a few things to keep in mind:
The first thing you need to consider is what you’ll be using the liquid urethane for. There are different formulas for different applications, so you need to make sure you get the right one.

Next, think about the properties you need your liquid urethane to have. For example, do you need it to be clear or opaque? UV resistant? Heat resistant? Each type of liquid urethane has different properties, so it’s important to select the one that best meets your needs.

Once you’ve narrowed down your choices, it’s time to start testing. The best way to do this is to buy small quantities of each type of liquid urethane and try them out. This will help you see how they perform in real-world conditions and narrow down your options even further.

Finally, once you’ve selected the liquid urethane that’s right for you, make sure to follow the manufacturer’s instructions carefully. This will help ensure that you get the best results and avoid any problems down the road.

liquid urethan kits

It is important to select the right liquid urethane for your needs to get the best results out of this versatile product. By understanding how density factors into its uses, you can be sure to select the correct liquid urethane for your specific project. Bottom Paint Store carries several different liquid urethane products including liquid urethane foam kits, which are a two-component, Isocyanate/Polyol based, pour-in-place, urethane foam system and Interlux Brushing Liquid 333, a slow drying solvent to ease brushing and facilitate the flow of specified paint coatings.

If you need additional information or ordering assistance on these liquid urethane products call our customer service team Monday through Friday 9:00 a.m.-5:00 p.m.

The Many Uses of Polyurethane Paint and Coatings

Polyurethane paint, also referred to as PU paint or PU coating, is a durable, highly-resistant coating used in industrial and architectural coating systems. It is popular in the marine industry and is used for numerous applications including coatings, rigid and flexible foams, and varnishes. It is also used in steelwork, concrete, wood, and other substrates.

Polyurethane is a reaction polymer, a combination of a polyol resin and an isocyanate hardener or curing agent. Essentially, a polyurethane coating is a liquid plastic which dries to form a paint-like film on an underlying substance or layer. Polyurethane paint provides durability, resistance to chemicals, water, abrasion, and temperature, as well as an attractive glossy finish. The most common application of polyurethane is as a solid foam, accounting for approximately 60% of all polyurethane produced.

What is polyurethane used for?

Polyurethane is a versatile material that can be used for a wide variety of applications. It is commonly used in the manufacture of plastics, insulation, and coatings. Polyurethane is also used in the production of adhesives, sealants, and elastomers. In addition, polyurethane is often used as a food additive and as a component in medical devices. Polyurethane is an ideal material for many applications due to its durability, flexibility, and resistance to chemicals and abrasion.

Marine Polyurethane Clear Coat

Polyurethane can be used to protect a boats paint and to keep the finish on wooden marine vessels visually appealing and more durable. You can apply polyurethane over any type of paint if it is clean and prepared properly. Polyurethane coatings can be applied to exposed wooden surfaces to create a glossy finish that serves to repel water, resist corrosion, and protect from scratches, stains, and UV damage.


Blue Water Marine Mega Gloss Polyurethane

Mega Gloss by Blue Water Marine is a single component topside polyurethane enamel that can be used on fiberglass, wood, aluminum, and steel. It provides a hard protective coating for super high gloss, color retention, and long durability. Mega Gloss is fast drying which when brushed or rolled, it can also be sprayed, and offers a smooth finish, is resistant to tough chemicals, cleaning solutions and ultraviolet light.

Polyurethane Foam Uses

Sea Hawk Polyurethane Foam

Sea Hawk polyurethane foam is urethane foam that provides excellent flotation, soundproofing or insulation. Mixed 1:1 and easy to install in hard-to-reach places. Poly-U-Foam bonds to wood, metal, and fiberglass. It foams wherever it is poured and is impervious to solvents and gasoline. A 2-quart kit will yield 2.5 cubic feet of space. Available in 2lb density. It is advised not to use below 70°F.

Liquid Urethane Foam Kit

Liquid urethane foam is a closed cell foam that comes in varied sizes, most commonly 2LB, 4LB, 8LB and 16LB densities. This two-part liquid, expanding rigid urethane foam is a closed cell, pourable foam, which will resist the absorption of water. It is the ideal boat foam for structural applications as it is resistant to water penetration and can be used for flotation, insulation, casting, carving, sculpting, sign making and areas where an extremely durable (you can penetrate with a fingernail) while it cannot be dented by hand, making it ideal for support.

Pettit Easypoxy/ EZ-Poxy

Pettit EZ-Poxy is an advanced one-part polyurethane topside and deck enamel. It’s a high gloss finish flows well when applied with a brush. It is a modern one-part polyurethane topside and deck enamel. It It’s use of silicone provides a brilliant shine and easy brush-ability. Its advanced ultraviolet filters enhance the superior gloss retention and durability of polyurethane. The result is a topside finish that is exceptionally easy to apply, producing a lasting gelcoat-like brilliance with a minimum of effort. It is more economical, requires less effort, and is more forgiving than the competition.

Easypoxy’s innovative ultraviolet filters improve gloss retention and enhance the polyurethane’s durability. This results in an end product that is simple to apply and easily creates an enduring shine and superior gloss retention, similar to that of polished gelcoat. Pettit Easypoxy is available in numerous colors.

Interlux Spray Reducing Solvent

Interlux’s Reducing Solvent 2316N is for use in specific two-part polyurethane and epoxy products. It is an amazingly effective, fast evaporating solvent. Safe for aluminum outdrives. Refer to the specific product directions for the amount to be used.

Interlux Pre-Kote

Pre-Kote® is a unique V.O.C. compliant, single package, undercoater or primer for use with Brightside® Polyurethane, Yacht Enamels, or anyone-part topside finish. Microspheres give Pre-Kote® superior build and hide while improving flow and sandability. Use anywhere above the true waterline where a coating is needed to provide a smooth, fair surface for overcoating with a topside enamel.

Interlux Goldspar Satin Varnish

Designed for interior wood surfaces, Interlux Goldspar Satin Varnish is a modified polyurethane low luster varnish. It produces a rich satin sheen finish that resists scratches and stains and applies easily enough to yield truly professional results by either brush or spray. It’s low luster finish makes it ideal for cabin soles, cabinets, counters, tables, as well as home interior finishes.

Urethane Paint

Urethane paint was created in the mid-1960s, utilizing newly developed plastics technology, and designed to be superior to enamel paint in terms of durability by mixing pigment with polyurethanes, which act as the binder to hold the pigment molecules together. Semi-gloss urethane paints have been developed, but all urethane paint will have some degree of glossiness, because the same properties that make it resilient also make it reflect light. It has become a staple in the marine and automotive industry because of its durability.

AwlGrip Topcoat

AwlGrip Topcoat is a polyester based high gloss polyurethane topcoat giving long lasting gloss and color retention. It can only be applied above the waterline of your boat by either a brush, roller, or spray. You should apply Awlgrip Topcoat in two coats of 1.5 to 2.5 mils WFT each and allow 16 hours between each coat. Sanding between coats with 280 to 400 grit paper will provide a smoother finish.

Interlux Perfection Plus

Considered by many as the ultimate clear wood varnish, Interlux Perfection Plus is a high-performance clear polyurethane, offering multiple solutions from one product delivering the ultimate in clear wood coating performance. The chemical cure urethane formulation combines with a best-in-class UV and HALS package to offer outstanding chemical and abrasion resistance, and superb gloss and gloss retention. It typically lasts four times longer than conventional one-part varnishes and can is suitable for all woods, including teak.