{"product_id":"3m-marine-adhesive-sealant-4000-uv-14316-uv-resistant-flexible-watertight-seal-for-fiberglass-metal","title":"3M Marine Adhesive Sealant 4000 UV (14316) — UV‑Resistant, Flexible Watertight Seal for Fiberglass \u0026 Metal","description":"\u003cp\u003e\u003cstrong\u003e3M 14316 Marine Adhesive Sealant 4000 UV is a one-component, polyurethane-based marine sealant that bonds and seals above- and below-the-waterline joints while resisting UV exposure and weathering.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis marine-grade sealant from 3M combines elasticity with strong adhesion to common boatbuilding substrates like fiberglass, metal, and painted surfaces. Formulated to withstand sunlight, salt spray and movement in hull components, it cures to a durable, flexible rubber that helps maintain watertight seals in demanding marine environments. It is paintable and sandable after cure, enabling a neat finish for visible applications.\u003c\/p\u003e\n\n\u003ch3\u003eHow does 3M 14316 perform on different boat materials?\u003c\/h3\u003e\n\u003cp\u003e3M 14316 adheres well to a wide variety of marine substrates, providing long-lasting seals on both rigid and semi-flexible materials. Proper surface preparation improves bond strength and durability.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEffective on fiberglass, gelcoat and painted surfaces when clean and dry.\u003c\/li\u003e\n  \u003cli\u003eWorks on metals like aluminum and stainless steel with suitable priming.\u003c\/li\u003e\n  \u003cli\u003eMaintains adhesion on wood and composite joints that experience movement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this sealant suitable for exposed seams and UV-heavy environments?\u003c\/h3\u003e\n\u003cp\u003eThe 4000 UV formulation is specifically designed to resist degradation from sunlight and weather, making it appropriate for exposed exterior seams. It retains flexibility after curing, helping joints tolerate thermal and mechanical movement without cracking.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUV-stable formulation minimizes chalking and breakdown from sun exposure.\u003c\/li\u003e\n  \u003cli\u003eRemains flexible to handle vibration and small joint shifts.\u003c\/li\u003e\n  \u003cli\u003eResists salt spray and typical marine weathering for long-term performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do you apply and finish 3M 14316 for best results?\u003c\/h3\u003e\n\u003cp\u003eApplication is straightforward with a cartridge gun; surfaces should be clean, dry and free of oils or old sealant. After tooling, the sealant skins and cures to a firm, flexible rubber that can be sanded and painted to match surrounding surfaces.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCut nozzle to desired bead size and apply with a standard caulking gun.\u003c\/li\u003e\n  \u003cli\u003eTool within the skinning time to ensure smooth contact and finish.\u003c\/li\u003e\n  \u003cli\u003eAllow full cure time before sanding or painting as per product guidance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat maintenance or cleanup is needed after using this sealant?\u003c\/h3\u003e\n\u003cp\u003eWet sealant can be cleaned with appropriate solvents; cured material must be removed mechanically. Scheduled inspections help identify areas requiring touch-up, especially where joint movement is frequent.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eClean tools and excess with solvent while uncured per instructions.\u003c\/li\u003e\n  \u003cli\u003eRemove cured sealant by cutting or abrading if repairs are required.\u003c\/li\u003e\n  \u003cli\u003eInspect joints periodically and reapply where degradation appears.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this product for? Boat owners, marine repair professionals, shipwrights and DIYers who need a durable, UV-resistant polyurethane sealant for above- and below-waterline joints will find 3M 14316 ideal. It suits repairs and new construction where flexibility, adhesion to common marine materials, and resistance to sun and salt are priorities. Choose this product when you need a professional-grade seal that can be sanded and painted for a clean, finished appearance.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can 3M 14316 be painted after curing?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — once fully cured, it can be sanded and painted for a finished look.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is 3M 14316 suitable below the waterline?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It bonds and seals joints used above and below the waterline when applied per instructions.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"3M","offers":[{"title":"Default Title","offer_id":48086716055710,"sku":"B08XY2MN7W","price":55.4,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/3m-14316-front-packaging.jpg?v=1785902813","url":"https:\/\/northtrailauto.ca\/products\/3m-marine-adhesive-sealant-4000-uv-14316-uv-resistant-flexible-watertight-seal-for-fiberglass-metal","provider":"North Trail Auto","version":"1.0","type":"link"}