{"product_id":"3m-marine-adhesive-sealant-4000-uv-14316-cartridge-uv-resistant-polyurethane-for-flexible-watertight-bonds","title":"3M Marine Adhesive Sealant 4000 UV – 14316 Cartridge, UV‑Resistant Polyurethane for Flexible Watertight Bonds","description":"\u003cstrong\u003e3M 14316 Marine Adhesive Sealant 4000 UV is a one-component, UV-resistant polyurethane sealant formulated for durable, flexible bonds and watertight seams on boats and marine hardware.\u003c\/strong\u003e\n\n\u003cp\u003eWhen you need a reliable, long-lasting seal for exterior marine surfaces, this 3M polyurethane combines elasticity with strong adhesion to common marine substrates. It cures to a flexible rubber that stands up to sun, salt spray, and movement, making it suitable for deck seams, hardware bedding, hatches, and other through-hull fittings. Unlike silicone, this product is paintable and intended for structural bonding where flexibility is required.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this sealant perform in sunlight and saltwater environments?\u003c\/h3\u003e\n\u003cp\u003eThe formulation resists UV degradation and maintains flexibility after prolonged sun exposure, helping seams stay intact rather than cracking. Its chemistry is chosen for marine conditions so it resists breakdown from salt spray and intermittent immersion. Expect consistent performance across seasons when applied according to surface prep and cure guidance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUV-stable polyurethane chemistry for reduced yellowing and embrittlement\u003c\/li\u003e\n  \u003cli\u003eSalt-spray resistance suitable for exterior marine use\u003c\/li\u003e\n  \u003cli\u003eMaintains elasticity to accommodate hull flexing and vibration\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat surfaces does it bond to and how strong is the adhesion?\u003c\/h3\u003e\n\u003cp\u003e3M 14316 bonds well to many common marine materials including fiberglass, painted metal, wood, and some plastics when surfaces are clean and dry. It creates a flexible, weatherproof joint rather than a rigid structural connection, so it is ideal for bedding and seam sealing. For critical load-bearing applications, it should be used in conjunction with mechanical fasteners.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEffective with fiberglass, wood, aluminum, and painted surfaces\u003c\/li\u003e\n  \u003cli\u003eProvides flexible, gap-filling adhesion for moving joints\u003c\/li\u003e\n  \u003cli\u003eCan be used with mechanical fasteners for structural assemblies\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do you apply and cure the 3M 14316 Marine Adhesive Sealant 4000 UV?\u003c\/h3\u003e\n\u003cp\u003eApplication requires clean, dry substrates and usually a cartridge gun for controlled bead placement. Tool the bead within the product’s skin-over window and allow full cure time; thickness, temperature and humidity affect cure speed. Excess uncured sealant can be removed with recommended solvents; cured material must be trimmed or mechanically removed.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eApply from a cartridge with a caulking gun; smooth with tooling solution\u003c\/li\u003e\n  \u003cli\u003eTypical skin-over and full cure depend on bead size and ambient conditions\u003c\/li\u003e\n  \u003cli\u003eCleanup of uncured material with manufacturer-recommended solvent\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan this sealant be painted and how does it age cosmetically?\u003c\/h3\u003e\n\u003cp\u003eUnlike many silicones, this polyurethane sealant accepts most topcoats after proper curing and priming, enabling a painted finish that blends with surrounding surfaces. Over time it may slightly change shade but remains flexible and functional. Always test compatibility with your chosen marine paint system on a small area first.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePaintable after full cure with appropriate primers if needed\u003c\/li\u003e\n  \u003cli\u003eHolds color reasonably well with UV-resistant formulation\u003c\/li\u003e\n  \u003cli\u003eTest first to confirm paint adhesion and desired finish\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this product for? Boat owners, marine technicians, riggers, and professional shipwrights who need a weatherproof, flexible sealing solution for exterior marine joints will find 3M 14316 Marine Adhesive Sealant 4000 UV useful. It’s tailored for applications where UV stability, paintability, and elastic bonding are priorities — for bedding deck hardware, sealing hatches, and closing panel seams. For purely structural load-bearing joins, combine with mechanical fasteners and follow 3M’s technical instructions and safety guidelines during application.\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: Is 3M 14316 paintable?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — once fully cured it accepts most marine topcoats; test primer compatibility first.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can it be used on submerged joints?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It resists intermittent immersion, but for fully submerged permanent joints confirm suitability and cure times per 3M guidance.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"3M","offers":[{"title":"Default Title","offer_id":55168488997207,"sku":"B08XY2MN7W","price":53.67,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/3m-14316-front-label.jpg?v=1790405383","url":"https:\/\/britishgarage.co.uk\/products\/3m-marine-adhesive-sealant-4000-uv-14316-cartridge-uv-resistant-polyurethane-for-flexible-watertight-bonds","provider":"British Garage","version":"1.0","type":"link"}