{"id":182,"date":"2011-02-14T21:38:37","date_gmt":"2011-02-15T02:38:37","guid":{"rendered":"http:\/\/www.bottompaintstore.com\/blog\/?p=182"},"modified":"2026-02-03T11:49:39","modified_gmt":"2026-02-03T16:49:39","slug":"apply-bottom-paint-bare-fiberglass","status":"publish","type":"post","link":"https:\/\/www.bottompaintstore.com\/blog\/bottom-paint\/apply-bottom-paint-bare-fiberglass\/","title":{"rendered":"How To Apply Bottom Paint To Bare Fiberglass"},"content":{"rendered":"<p class=\"post-updated\"><strong>Last Updated: January 30, 2026<\/strong><!--?php echo get_the_modified_date('F j, Y'); ?--><\/p>\n<p><!-- Quick Recommendation Box: Applying Bottom Paint to Bare Fiberglass --><\/p>\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;\">\n<p style=\"margin: 0 0 8px; font-size: 13px; letter-spacing: .06em; text-transform: uppercase; color: #0a6fb5; font-weight: bold;\">Quick Recommendation<\/p>\n<h2 style=\"margin: 0 0 10px; font-size: 20px; line-height: 1.25;\">Can You Apply Bottom Paint to Bare Fiberglass?<\/h2>\n<ul style=\"margin: 0; padding-left: 18px; line-height: 1.6;\">\n<li><strong>Yes\u2014but prime first:<\/strong> Bare fiberglass typically needs an <strong>epoxy primer or barrier coat<\/strong> to ensure adhesion and long-term protection.<\/li>\n<li><strong>Prep correctly:<\/strong> Clean, de-wax, and sand to the proper profile before applying any primer or bottom paint.<\/li>\n<li><strong>Choose the right bottom paint:<\/strong> Match the paint type (ablative vs hard) to your <strong>water conditions<\/strong> and <strong>boat usage<\/strong>.<\/li>\n<li><strong>Bottom line:<\/strong> Bottom paint can go over bare fiberglass, but skipping the correct primer system is a common cause of <strong>peeling and premature failure<\/strong>.<\/li>\n<\/ul>\n<p style=\"margin: 12px 0 0; color: #555; line-height: 1.5;\"><strong>Tip:<\/strong> If your fiberglass has never been bottom-painted, a barrier coat system is often the best long-term foundation before antifouling paint.<\/p>\n<\/div>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: small;\"><span style=\"font-size: x-small;\">The following steps should be taken to insure\u00a0good adhesion\u00a0of\u00a0<a href=\"\/boat-bottom-paint-c-13523.html\">bottom paint<\/a> to a fiberglass or gelcoated hull.<\/span><\/span><\/p>\n<p><em><strong><span style=\"font-size: small;\">Premium Blister Protection and Adhesion System ** Best Paint Option<\/span><\/strong><\/em><\/p>\n<ul>\n<li><strong>Sand and Clean:<\/strong> Sand to a uniformly frosty, dull looking surface with 80-100 grit (no \ufb01ner) sandpaper, rewash with\u00a0<span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"\/wax-n-grease-killer-solvent-wash-p-9489.html\"><strong>S-80 Wax N\u2019 Grease Killer<\/strong> <\/a><\/span>or <span style=\"color: #0000ff;\"><strong><a style=\"color: #0000ff;\" href=\"\/low-voc-dewaxing-etch-cleaner-gl-p-9490.html\">S-90 De-Wax Etch &amp; Cleaner.<\/a><\/strong><\/span><\/li>\n<li><strong>Apply Primer:<\/strong> Seal the surface with 2-3 coats of\u00a0<span style=\"color: #0000ff;\"><strong><a style=\"color: #0000ff;\" href=\"\/tuff-stuff-highbuild-epoxy-primer-12gl-kit-p-9473.html\">Tuff Stuff<\/a><\/strong><\/span>, or other high build epoxy primer. For Tuff Stuff, apply the \ufb01rst coat of primer and allow the surface to dry to become tacky. Temperature and humidity affect the dry time, but you will know when to apply your next coat of primer once the paint \ufb01lm becomes \u201ctacky\u201d. You should be able to \ufb01rmly press your thumb into the paint \ufb01lm and leave a thumbprint without any primer coming off the surface. You should use this method in between coats of primer and your \ufb01rst coat of antifouling paint. When applying over multiple days, it is always best to go overnight between coats of primer instead going overnight between the \ufb01nal coat of primer and the \ufb01rst coat of bottom paint. Additional information can be found on the <span style=\"color: #0000ff;\"><strong><a style=\"color: #0000ff;\" href=\"http:\/\/www.seahawkpaints.com\/Libraries\/Tech_Sheets\/TechSheet_1284TuffStuffEpoxyPrimer.sflb.ashx\">Tuff Stuff<\/a>\u00a0<\/strong><\/span>Technical Data Sheets.<\/li>\n<li><strong>Apply Bottom Paint: <\/strong>Apply minimum of two coats of\u00a0<a href=\"\/boat-bottom-paint-c-13523.html\"><span style=\"color: #0000ff;\"><strong>Sea Hawk bottom paint<\/strong><\/span><\/a>. Allow 3 to 6 hours between coats and a minimum overnight dry. See the speci\ufb01c Technical Data Sheet for antifoulant being used. Some antifoulants may require more than 2 coats.<\/li>\n<\/ul>\n<p><em><strong><span style=\"font-size: small;\">Sanding System** Better Paint Option<\/span><\/strong><\/em><\/p>\n<ul>\n<li><strong>Sand and Clean: <\/strong>Sand to a uniformly frosty, dull looking surface with 80-100 grit (no \ufb01ner) sandpaper, remove any residue.<\/li>\n<li><strong>Apply Bottom Paint:<\/strong> Apply minimum of two coats of<span style=\"color: #0000ff;\"><strong>\u00a0<a style=\"color: #0000ff;\" href=\"\/boat-bottom-paint-c-13523.html\">bottom paint<\/a>.<\/strong><\/span> Allow 3 to 6 hours between coats and a minimum overnight dry. See the speci\ufb01c Technical Data Sheet for antifoulant being used. Some antifoulants may require more than 2 coats.<\/li>\n<\/ul>\n<p><em><strong><span style=\"font-size: small;\">Simple No Sand System ** Good Paint Option<\/span><\/strong><\/em><\/p>\n<ul>\n<li><strong>Apply Primer: <\/strong>Apply one thin coating of\u00a0<a href=\"\/sandless-primer-gl-p-9507.html\"><span style=\"color: #0000ff;\"><strong>1266 Non-Sanding Primer<\/strong><\/span><\/a>. This coating is applied at a maximum of 1-2 mils WFT. Excessive buildup can cause a lack of adhesion. Minimum dry time is 20 minutes with a maximum of one hour.<\/li>\n<li><strong>Apply Antifoulant: <\/strong>Apply minimum of two coats of<span style=\"color: #0000ff;\"><strong>\u00a0<a style=\"color: #0000ff;\" href=\"\/boat-bottom-paint-c-13523.html\">Sea Hawk antifouling paint<\/a>.<\/strong><\/span> Apply \ufb01rst coat of antifouling within 2 hours of applying primer. Apply 2nd coat of antifouling allowing 3 to 6 hours between coats and a minimum overnight dry.<\/li>\n<\/ul>\n<p><strong>Note: <\/strong>Do NOT use a copper based paint on metal running gear and parts. You should use a metal free bottom paint such as <span style=\"color: #3366ff;\"><a style=\"color: #3366ff;\" href=\"https:\/\/www.bottompaintstore.com\/premium-outdrive-bottom-paint-kit-p-33333.html\"><span style=\"color: #0000ff;\"><strong>Sea Hawk Outdrive Paint<\/strong><\/span><\/a><\/span>,\u00a0priming it with<span style=\"color: #0000ff;\"><strong> <a style=\"color: #0000ff;\" href=\"https:\/\/www.bottompaintstore.com\/tuff-stuff-highbuild-epoxy-primer-by-sea-hawk-paints-p-9473.html\">Tuff Stuff <\/a>first.<\/strong><\/span><\/p>\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 30, 2026 Quick Recommendation Can You Apply Bottom Paint to Bare Fiberglass? Yes\u2014but prime first: Bare fiberglass typically needs an epoxy primer or barrier coat to ensure adhesion and long-term protection. Prep correctly: Clean, de-wax, and sand to the proper profile before applying any primer or bottom paint. Choose the right bottom [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[6,10],"tags":[67,112,113,63,28],"class_list":["post-182","post","type-post","status-publish","format-standard","hentry","category-bottom-paint","category-primer","tag-apply-bottom-paint","tag-bottom-paint-on-bare-fiberglass","tag-bottom-paint-on-fiberglass","tag-how-to-apply-bottom-paint","tag-is-bottom-paint-primer-needed"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/posts\/182","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\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/comments?post=182"}],"version-history":[{"count":20,"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/posts\/182\/revisions"}],"predecessor-version":[{"id":4150,"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/posts\/182\/revisions\/4150"}],"wp:attachment":[{"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/media?parent=182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/categories?post=182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bottompaintstore.com\/blog\/wp-json\/wp\/v2\/tags?post=182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}