{"product_id":"3m-urethane-seam-sealer-08368-white-310-ml-cartridge-flexible-paintable-non-shrinking","title":"3M Urethane Seam Sealer 08368 White 310 mL Cartridge — Flexible, Paintable, Non‑shrinking","description":"\u003cb\u003e3M Urethane Seam Sealer 08368 is a single-component, moisture-curing urethane sealant designed to fill and seal seams, joints and gaps on automotive and RV metal surfaces.\u003c\/b\u003e\n\n\u003cp\u003eThis high-solids urethane comes in a 310 mL (10.5 fl oz) cartridge and bonds to bare metal, primed panels and painted substrates. It offers permanent flexibility, resists shrinking and cracking, and can be tooled to a fine featheredge or brushed for a neat finish. The product cures in 24 hours, becomes tack-free and paintable in roughly 30–45 minutes, and is formulated to outperform traditional solvent-based seam sealers in hot or humid conditions.\u003c\/p\u003e\n\n\u003ch3\u003eHow quickly can I paint or finish after applying this seam sealer?\u003c\/h3\u003e\n\u003cp\u003eThe sealer reaches a tack-free state and accepts paint in about 30–45 minutes under normal shop conditions. Full cure is achieved in approximately 24 hours, providing the final elastomeric properties you expect from a urethane system.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTack-free and paintable: 30–45 minutes\u003c\/li\u003e\n  \u003cli\u003eFunctional cure: 24 hours for full flexibility\u003c\/li\u003e\n  \u003cli\u003eWork time: roughly 10 minutes after bead placement\u003c\/li\u003e\n  \u003cli\u003eAllow longer cure in cold or very humid environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this adhere to different auto surfaces and how is it applied?\u003c\/h3\u003e\n\u003cp\u003eYes — the one-component formula adheres reliably to bare metal, primed metal and factory paint, giving technicians a versatile sealing option. It’s dispensed from a standard cartridge gun and can be tooled, feathered or brushed to match surrounding contours.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with bare, primed and painted metal\u003c\/li\u003e\n  \u003cli\u003eUse a standard 10.5 fl oz cartridge gun for application\u003c\/li\u003e\n  \u003cli\u003eTool or brush to blend edges or fill large voids\u003c\/li\u003e\n  \u003cli\u003eDesigned for industrial and occupational use only\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this urethane seam sealer perform compared with solvent-based products?\u003c\/h3\u003e\n\u003cp\u003e3M’s urethane formula delivers greater elasticity and long-term durability versus solvent-based alternatives, which can shrink or crack over time. The moisture-curing chemistry also keeps the bead stable in high heat and humidity, making it suitable for demanding automotive and RV environments.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNon-shrinking and non-cracking for long-term seals\u003c\/li\u003e\n  \u003cli\u003eMaintains flexibility for dynamic joints and panels\u003c\/li\u003e\n  \u003cli\u003ePerforms well in hot, humid conditions thanks to moisture cure\u003c\/li\u003e\n  \u003cli\u003eHigh-solids formulation fills gaps without excessive sagging\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should technicians know about working time and toolability?\u003c\/h3\u003e\n\u003cp\u003eAfter extrusion, you typically have about ten minutes of workable time to tool, smooth or brush the bead before it begins to skin over. Because the product can be feathered to a fine edge, it’s suitable for both structural seam filling and cosmetic finishing when matched with proper surface prep and tooling.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eApproximate work time: 10 minutes after application\u003c\/li\u003e\n  \u003cli\u003eCan be feathered, tooled or brushed for a clean finish\u003c\/li\u003e\n  \u003cli\u003eBest results when surfaces are clean, dry and free of contaminants\u003c\/li\u003e\n  \u003cli\u003eFull mechanical properties after 24-hour cure\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThis cartridge is intended for professional, industrial or occupational use and is not sold for consumer DIY applications. For safety and performance, follow 3M’s product data sheet, observe shop ventilation practices, and use appropriate personal protective equipment.\u003c\/p\u003e\n\n\u003cp\u003eWho is this for: 3M Urethane Seam Sealer 08368 is aimed at collision repair shops, RV service centers, fleet maintenance crews and industrial body shops that need a robust, flexible seam filler that accepts primer and paint quickly. It’s ideal for technicians who require a durable, moisture-curing product that fills large gaps, smooths to a featheredge, and withstands challenging environmental conditions.\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 Urethane Seam Sealer 08368 paintable right away?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It becomes tack-free and paintable in about 30–45 minutes; full cure is around 24 hours.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can it be used on bare metal and painted panels?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the single-component formula adheres to bare metal, primed metal and painted surfaces.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"3M","offers":[{"title":"Default Title","offer_id":55167890227543,"sku":"B007NIQONO","price":44.45,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/3m-urethane-seam-sealer-front-label.jpg?v=1790395247","url":"https:\/\/britishgarage.co.uk\/products\/3m-urethane-seam-sealer-08368-white-310-ml-cartridge-flexible-paintable-non-shrinking","provider":"British Garage","version":"1.0","type":"link"}