{"id":2703,"date":"2021-10-19T11:08:18","date_gmt":"2021-10-19T15:08:18","guid":{"rendered":"https:\/\/www.bottompaintstore.com\/blog\/?p=2703"},"modified":"2026-05-19T12:10:48","modified_gmt":"2026-05-19T16:10:48","slug":"how-can-gelcoat-be-used-to-repair-fiberglass-surfaces","status":"publish","type":"post","link":"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/how-can-gelcoat-be-used-to-repair-fiberglass-surfaces\/","title":{"rendered":"How Can Gelcoat Be Used to Repair Fiberglass Surfaces?"},"content":{"rendered":"<p class=\"post-updated\"><strong>Last Updated: January 20, 2026<\/strong><!--?php echo get_the_modified_date('F j, Y'); ?--><\/p>\r\n<!-- Quick Recommendation Box: Using Gelcoat to Repair Fiberglass -->\r\n<div class=\"bps-quick-reco\" style=\"border: 1px solid #e5e5e5; border-left: 6px solid #0a6fb5; background: #f8fbff; padding: 16px 18px; margin: 14px 0 22px; border-radius: 8px;\">\r\n<p style=\"margin: 0 0 8px; font-size: 13px; letter-spacing: .06em; text-transform: uppercase; color: #0a6fb5; font-weight: bold;\">Quick Recommendation<\/p>\r\n<h2 style=\"margin: 0 0 10px; font-size: 20px; line-height: 1.25;\">Using Gelcoat to Repair Fiberglass Surfaces<\/h2>\r\n<ul style=\"margin: 0; padding-left: 18px; line-height: 1.6;\">\r\n<li><strong>Use <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> for surface repairs<\/strong> such as scratches, chips, gouges, and cosmetic damage where the fiberglass structure is still sound.<\/li>\r\n<li><strong>Prep thoroughly:<\/strong> Clean, grind or sand damaged areas, and remove wax or contaminants before applying <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a>.<\/li>\r\n<li><strong>Apply in thin layers<\/strong> and allow proper curing between coats for best adhesion and finish quality.<\/li>\r\n<li><strong>Bottom line:<\/strong> <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> is ideal for <strong>restoring appearance and protection<\/strong>, but structural damage requires fiberglass repair before <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> is applied.<\/li>\r\n<\/ul>\r\n<p style=\"margin: 12px 0 0; color: #555; line-height: 1.5;\"><strong>Tip:<\/strong> <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> exposed to air will remain tacky\u2014use a <strong>wax additive or PVA<\/strong> on the final coat to achieve a full cure.<\/p>\r\n<\/div>\r\n<p>&nbsp;<\/p>\r\n\r\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" class=\"wp-image-3095\" src=\"https:\/\/www.bottompaintstore.com\/blog\/wp-content\/uploads\/EXT-Gelcoat-150x150-1.jpg\" alt=\"\" \/><\/figure>\r\n\r\n<div class=\"content-section gelcoat-fiberglass-repair-guide\">\r\n<h2>How Is Gelcoat Used to Repair Fiberglass Surfaces?<\/h2>\r\n<p><a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> is used to repair fiberglass surfaces by filling, sealing, and refinishing the outer cosmetic layer of a fiberglass boat. It is commonly used for small chips, scratches, gouges, spider cracks, worn areas, and cosmetic damage where the fiberglass structure underneath is still sound.<\/p>\r\n<p><a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> is not a structural repair by itself. If the fiberglass is cracked deeply, soft, punctured, delaminated, or damaged below the surface, the fiberglass laminate should be repaired first with resin, fiberglass cloth, filler, or fairing compound. <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> is then applied as the final protective and cosmetic surface.<\/p>\r\n<h2>Best Gelcoat Repair Method by Damage Type<\/h2>\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Fiberglass Damage<\/th>\r\n<th>Recommended Repair<\/th>\r\n<th>Why It Works<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Light surface scratches<\/td>\r\n<td>Wet sanding, compounding, and polishing<\/td>\r\n<td>If the <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> is not deeply damaged, the surface may be restored without adding new <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a>.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Small <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> chips<\/td>\r\n<td><a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> paste or <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> repair kit<\/td>\r\n<td>Fills the damaged outer layer and helps restore color, gloss, and protection.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Hairline cracks or spider cracks<\/td>\r\n<td>Open the crack slightly, clean, fill with <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> or marine filler, then finish<\/td>\r\n<td>Simply covering the crack may not last; opening and filling helps create a better repair.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Deep gouges<\/td>\r\n<td>Marine filler or fairing compound, followed by <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a><\/td>\r\n<td>Filler rebuilds the shape, while <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> restores the finished surface.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Small holes or exposed fiberglass<\/td>\r\n<td>Fiberglass cloth and resin if needed, then fairing and <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a><\/td>\r\n<td>Structural strength should be restored before <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> is used as the finish layer.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Large cracks or impact damage<\/td>\r\n<td>Fiberglass laminate repair, fairing compound, then <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a><\/td>\r\n<td><a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> alone will not fix deeper laminate damage or restore strength.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Faded or oxidized <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a><\/td>\r\n<td>Clean, compound, polish, and wax or seal<\/td>\r\n<td>Oxidized <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> can often be restored before re-gelcoating is necessary.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2>Basic Steps for Repairing Fiberglass with Gelcoat<\/h2>\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Step<\/th>\r\n<th>What to Do<\/th>\r\n<th>Why It Matters<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>1. Inspect the damage<\/td>\r\n<td>Determine whether the damage is only in the <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> or extends into the fiberglass laminate.<\/td>\r\n<td><a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> repairs cosmetic damage; deeper fiberglass damage needs structural repair first.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>2. Clean and dewax the area<\/td>\r\n<td>Remove wax, grease, salt, dirt, oil, and other contaminants.<\/td>\r\n<td><a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> will not bond properly to a dirty or waxy surface.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>3. Sand the repair area<\/td>\r\n<td>Sand the damaged area and feather the edges around the repair.<\/td>\r\n<td>Sanding improves adhesion and helps the repair blend into the surrounding surface.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>4. Fill deeper damage if needed<\/td>\r\n<td>Use marine filler, fairing compound, fiberglass cloth, and resin when the damage is deeper than the <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> layer.<\/td>\r\n<td><a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> should be applied over a stable, repaired surface, not used to replace missing structure.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>5. Mix <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> and <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">catalyst<\/a><\/td>\r\n<td>Measure <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">MEKP<\/a> <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">catalyst<\/a> carefully and mix thoroughly according to the product directions.<\/td>\r\n<td>Incorrect <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">catalyst<\/a> ratio can cause <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> to cure too slowly, stay tacky, crack, or fail.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>6. Apply the <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a><\/td>\r\n<td>Brush, spread, roll, or spray the <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> depending on the size of the repair.<\/td>\r\n<td>The application method depends on whether you are fixing a small chip or refinishing a larger area.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>7. Allow proper curing<\/td>\r\n<td>Use wax additive, PVA, or another recommended air-blocking method if needed.<\/td>\r\n<td>Unwaxed <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> may remain tacky if the surface is exposed to air during cure.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>8. Sand, compound, and polish<\/td>\r\n<td>Once cured, wet sand the repair smooth, then compound and polish to blend the finish.<\/td>\r\n<td>Finishing helps the new <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> match the surrounding fiberglass surface.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2>When Gelcoat Is Enough vs. When Fiberglass Repair Is Needed<\/h2>\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Situation<\/th>\r\n<th>Is <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> Enough?<\/th>\r\n<th>Recommended Next Step<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Small surface chip with no exposed fibers<\/td>\r\n<td>Usually yes<\/td>\r\n<td>Use <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> paste or a <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> repair kit.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Scratch that disappears after light sanding or compounding<\/td>\r\n<td>Possibly no new <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> needed<\/td>\r\n<td>Restore with wet sanding, compound, polish, and protection.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Crack exposes fiberglass fibers<\/td>\r\n<td>No<\/td>\r\n<td>Repair the fiberglass or fill the damage before applying <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a>.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Soft, flexible, or spongy area<\/td>\r\n<td>No<\/td>\r\n<td>Inspect for deeper laminate or core damage before finishing.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Hole through the fiberglass<\/td>\r\n<td>No<\/td>\r\n<td>Rebuild with fiberglass cloth and resin, then fair and <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a>.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Cosmetic repair above the waterline<\/td>\r\n<td>Often yes<\/td>\r\n<td>Color-match <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a>, apply, cure, sand, and polish.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Repair below the waterline<\/td>\r\n<td>Sometimes, but not by itself<\/td>\r\n<td>Repair fiberglass, seal properly, and finish with the correct underwater coating system if needed.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2>What to Consider Before Using Gelcoat for Fiberglass Repair<\/h2>\r\n<p>Before using <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a>, determine whether the repair is cosmetic or structural. <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> is excellent for restoring the outside surface of a fiberglass boat, but it should not be used as a substitute for fiberglass cloth, resin, or filler when strength is needed.<\/p>\r\n<p>You should also consider color matching, cure method, and location. A small white <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> repair above the waterline may be straightforward, while a highly visible colored repair may require tinting and careful blending. Repairs below the waterline may require additional sealing, primer, barrier coat, or bottom paint depending on the project.<\/p>\r\n<h2>Common Questions About Using Gelcoat to Repair Fiberglass<\/h2>\r\n<h3>Can gelcoat be used to repair fiberglass?<\/h3>\r\n<p>Yes, <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> is commonly used to repair the outer surface of fiberglass boats. It works well for chips, scratches, gouges, and cosmetic repairs. If the fiberglass underneath is cracked, weak, or damaged, the structural repair should be completed before applying <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a>.<\/p>\r\n<h3>Is gelcoat a structural repair?<\/h3>\r\n<p>No. <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> is primarily a cosmetic and protective surface layer. It can seal and finish a repair, but it does not replace the strength of fiberglass cloth, resin, or laminate repair materials.<\/p>\r\n<h3>Can I use gelcoat over exposed fiberglass?<\/h3>\r\n<p><a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> can be applied over properly prepared fiberglass, but exposed or damaged fiberglass may need resin, filler, or fairing compound first. The surface should be clean, dry, sanded, stable, and compatible before <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> is applied.<\/p>\r\n<h3>What is the difference between gelcoat repair and fiberglass repair?<\/h3>\r\n<p><a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> repair fixes the outer finish of a fiberglass surface. Fiberglass repair fixes the laminate underneath when the damage is deeper, cracked, punctured, or weakened. Many boat repairs require both fiberglass repair for strength and <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> for the final appearance.<\/p>\r\n<h3>Can you brush gelcoat onto a fiberglass repair?<\/h3>\r\n<p>Yes, <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> can be brushed onto small fiberglass repairs. Brushing may leave texture or brush marks, so the cured <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> is often sanded, compounded, and polished afterward to blend with the surrounding surface.<\/p>\r\n<h3>Do you need wax in gelcoat for repairs?<\/h3>\r\n<p>Wax additive or PVA may be needed when <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> is used as a final coat. Unwaxed <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> can remain tacky when exposed to air, so the final coat may need an air-blocking method to cure properly.<\/p>\r\n<h3>How do you match gelcoat color?<\/h3>\r\n<p>Start by cleaning and polishing a small area near the repair, then compare the color to a <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> color chart, repair kit, or manufacturer color reference. Older <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> may have faded, so tinting or blending may be needed for the closest match.<\/p>\r\n<h3>Can gelcoat be used below the waterline?<\/h3>\r\n<p><a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> is used on fiberglass hulls, but a below-waterline repair may also need proper sealing, barrier coat, primer, or bottom paint depending on how the boat is used. <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> is not the same as antifouling bottom paint.<\/p>\r\n<h3>Why did my gelcoat repair stay tacky?<\/h3>\r\n<p><a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> may stay tacky if unwaxed <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> was used without PVA or wax additive. It can also stay soft because of incorrect <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">MEKP<\/a> <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">catalyst<\/a> ratio, poor mixing, low temperature, expired materials, or surface contamination.<\/p>\r\n<h3>Do you have to sand and polish gelcoat after repair?<\/h3>\r\n<p>Most <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> repairs need sanding, compounding, and polishing after curing if you want the repair to blend smoothly with the surrounding surface. This step removes excess material, smooths the repair, and restores gloss.<\/p>\r\n<h2>Recommended Gelcoat and Fiberglass Repair Supplies<\/h2>\r\n<p>Bottom Paint Store carries <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> repair kits, white and colored <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a>, neutral <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a>, <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">MEKP<\/a> <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">catalyst<\/a>, wax additive, PVA, fiberglass cloth, fiberglass mat, polyester resin, epoxy resin, fillers, fairing compounds, sandpaper, polishing compound, cleaners, and related application supplies. The right product depends on the size of the repair, whether the fiberglass is structurally damaged, and whether the final surface needs to be color matched, painted, or bottom painted.<\/p>\r\n<\/div>\r\n\r\n<p>It&#8217;s no secret that fiberglass surfaces can be extremely fragile and susceptible to damage. Even the smallest nick or crack can quickly become a larger problem, leading to an unsightly and potentially hazardous mess. Fortunately, there is a fix for most common fiberglass issues \u2013 <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a>! This article will explain what <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> is, how it can be used to repair fiberglass surfaces, and some of its benefits. Keep reading to learn more!<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">What is gel coat?<\/h2>\r\n\r\n\r\n\r\n<p><a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> is a specialized resin and is popular as a surface coating in the fabrication and repair of fiberglass-based products and can also be used to patch existing gel coat, fiberglass repairs, and new construction and repair projects. <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> is extremely durable and provides a high-quality finish to visible surfaces making it a popular solution for damages to fiberglass surfaces such as covering up blemishes, patching small holes, filling cracks, and renewing surface shine. <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> is often referred to as a one-stop solution for almost all types of damages on fiberglass surfaces such as, boats, jet skis, wave runners, swimming pools, hot tubs, showers and more.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\"><strong>Gelcoat for Swimming Pools<\/strong><\/h3>\r\n\r\n\r\n\r\n<p>If you have a fiberglass pool then its surface is made of <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a>, a liquid-colored resin that is applied to the pool shell. <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> is the considered one of the most durable pool surfaces, typically lasting several decades, depending on maintenance, wear and tear, and the quality of the surface. Concrete pools need to be refinished about every ten years or so.<\/p>\r\n\r\n\r\n\r\n<p>One of the more common areas of a fiberglass pool that needs to be refinished over time are the pool steps which can fade after exposure to pool chemicals, weather and UV rays. For more information please refer to our <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/how-to-paint-your-fiberglass-pool-steps\/\">How to Gelcoat your Fiberglass Pool Steps<\/a> article.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\"><strong>Gelcoat for Shower Stalls, Bathtubs<\/strong>, <strong>and Hot tubs<\/strong><\/h3>\r\n\r\n\r\n\r\n<p>Cracks, holes, chips, and stains in showers and tubs made from fiberglass can be repaired with <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a>. A common rule of thumb is if the hole is smaller than 1\/2 inch, you should be able to make the repairs yourself; if it is a larger hole, then it may require the replacement of the surface or unit.<\/p>\r\n\r\n\r\n\r\n<p>Fixing the damaged area requires applying two-part epoxy that hardens to the strength of the surrounding surface.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\"><strong>Gelcoat for a Fiberglass Deck<\/strong><\/h3>\r\n\r\n\r\n\r\n<p>Applying <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> to a fiberglass deck is a great way to protect the surface from UV damage and environmental elements. <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> is a clear or tinted resin that is applied to the surface of the deck, creating a protective barrier. The <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> will need to be reapplied every few years in order to maintain its effectiveness. When applying <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a>, it is important to use a natural bristle brush in order to avoid damaging the fibers of the deck. In addition, <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> should be applied in thin coats in order to avoid runs and sags. With proper application, <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> can provide many years of protection for your fiberglass deck.<\/p>\r\n\r\n\r\n\r\n<p>One of the most common ways to refinish a fiberglass deck is with a <a href=\"https:\/\/www.bottompaintstore.com\/Liquid-Urethane-Foam-Kit-8LB-Density-Closed-Cell?search=two-part%20polyurethane&amp;description=true&amp;sort=relevance&amp;order=DESC\">two-part polyurethane<\/a>, as the results will provide a finish that will look as good as and should last at as long as the original <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a>.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\"><strong>Re-gelcoating a Boat Fiberglass Hull<\/strong><\/h3>\r\n\r\n\r\n\r\n<p>Regularly waxed <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> can last up to 15 years, depending on how well you take care of your boats hull and exposure to UV rays. If your hull is showing signs of damage such as cracking or is no longer retaining its gloss, and has chalky white powder on the surface, then it is time to re-<a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> your hull. <a href=\"https:\/\/www.bottompaintstore.com\/blue-water-marine-973-dewaxer\">Dewaxer<\/a> is perfect for dewaxing the hull and effectively cleaning up paint supplies.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Repairing a Fiberglass Boat<\/h3>\r\n\r\n\r\n\r\n<p>Repairing a fiberglass boat is not as difficult as it may seem. In fact, with the right materials and some basic knowledge, you can easily repair <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> cracks and holes. The first step is to clean the area around the crack or hole. This will help to ensure that the repair area is free of debris and dirt. Next, use a <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> patch kit to apply a thin layer of <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> to the damaged area. Once the <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> has cured, sand it down until it is flush with the surrounding area. Finally, apply a fresh coat of paint to protect the <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> from UV rays and weathering. With some patience and attention to detail, you can easily repair <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> cracks and holes yourself.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\"><strong>Be Prepared for your Gelcoat Project<\/strong><\/h3>\r\n\r\n\r\n\r\n<p>Using <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a> can be an excellent solution for repairing and renewing fiberglass-based surfaces. <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">Gelcoat<\/a> is sometimes referred to as <a href=\"https:\/\/www.bottompaintstore.com\/fiberglass-and-gel-coat-repair-c-13581.html\">marine paint for fiberglass<\/a>, however it is not a paint, so if you are unfamiliar with applying <a href=\"https:\/\/www.bottompaintstore.com\/blog\/gelcoat\/gelcoat-did-not-cure-what-caused-it-and-whats-next\/\">gelcoat<\/a>, please see our numerous <a href=\"https:\/\/www.bottompaintstore.com\/how-to\">how to articles<\/a> as it can be difficult to apply and achieve optimal results for first time users. You can also contact <a href=\"https:\/\/www.bottompaintstore.com\/\"> Bottom Paint Store\u2019s<\/a> technical team from 8:30-5:00pm EST Monday through Friday.<\/p>\r\n<script type=\"text\/javascript\" charset=\"utf-8\" src=\"http:\/\/w.sharethis.com\/widget\/?wp=6.9.7\"><\/script>","protected":false},"excerpt":{"rendered":"<p>Last Updated: January 20, 2026 Quick Recommendation Using Gelcoat to Repair Fiberglass Surfaces Use gelcoat for surface repairs such as scratches, chips, gouges, and cosmetic damage where the fiberglass structure is still sound. Prep thoroughly: Clean, grind or sand damaged areas, and remove wax or contaminants before applying gelcoat. Apply in thin layers and allow [&hellip;]<\/p>\n","protected":false},"author":822,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[7],"tags":[536,534,535,538,531,532,555,537,597],"class_list":["post-2703","post","type-post","status-publish","format-standard","hentry","category-gelcoat","tag-gelcoat-for-a-fiberglass-deck","tag-gelcoat-for-bathtubs","tag-gelcoat-for-hot-tubs","tag-gelcoat-for-pool-steps","tag-gelcoat-for-pools","tag-gelcoat-for-shower-stalls","tag-marine-paint-for-fiberglass","tag-re-gelcoating-a-boat-fiberglass-hull","tag-repairing-fiberglass-boat"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/posts\/2703","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/users\/822"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/comments?post=2703"}],"version-history":[{"count":10,"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/posts\/2703\/revisions"}],"predecessor-version":[{"id":4242,"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/posts\/2703\/revisions\/4242"}],"wp:attachment":[{"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/media?parent=2703"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/categories?post=2703"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/tags?post=2703"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}