{"product_id":"j-b-weld-radiator-repair-kit-2120-3-8-hole-4-crack-patch-epoxy-putty-with-fiberglass-cloth","title":"J-B Weld radiator repair kit 2120 — 3\/8\" hole \u0026 4\" crack patch, epoxy putty with fibreglass cloth","description":"\u003cb\u003eJ-B Weld 2120 Radiator Repair Kit is a ready-to-use repair system that seals leaks in plastic radiator tanks and metal surfaces without removing the part.\u003c\/b\u003e\n\n\u003cp\u003eThis kit combines epoxy putty, fiberglass cloth, sandpaper and an applicator to create a durable, heat-resistant patch for holes, cracks and weeps in radiators, washer reservoirs and other fluid-containing components. It’s formulated to bond to plastics, composites and metals commonly found in cooling systems so you can perform repairs on-vehicle or on-bench with straightforward steps.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the kit stop radiator leaks without removing the tank?\u003c\/h3\u003e\n\u003cp\u003eThe repair system cures into a hard, adhesion-focused patch that fills gaps and reinforces the damaged area. Applied directly over the leak after surface prep, the fiberglass and epoxy combination conforms to irregular shapes and creates a seal that resists coolant and vibration.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEpoxy putty molds to shape and hardens to form a solid repair.\u003c\/li\u003e\n  \u003cli\u003eFiberglass cloth adds tensile strength and crack resistance.\u003c\/li\u003e\n  \u003cli\u003eSandpaper ensures a roughened surface for better adhesion.\u003c\/li\u003e\n  \u003cli\u003eApplicator helps seat the patch and remove excess material.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat size damage can the J-B Weld 2120 kit handle?\u003c\/h3\u003e\n\u003cp\u003eThis kit is designed for small- to medium-sized repairs: it fills holes up to about 3\/8\" diameter and stabilizes cracks up to approximately 4\" long when applied per instructions. Larger or structural failures may require part replacement or professional service.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIdeal for pinholes, small punctures and hairline cracks.\u003c\/li\u003e\n  \u003cli\u003eEffective for washer fluid tanks, overflow reservoirs and radiator tanks.\u003c\/li\u003e\n  \u003cli\u003eNot intended as a permanent fix for severely crushed or corroded cores.\u003c\/li\u003e\n  \u003cli\u003eWorks on both plastic tanks and many metal surfaces when prepped.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow long does the repair take and what environmental conditions matter?\u003c\/h3\u003e\n\u003cp\u003eCuring time varies with temperature and humidity; the epoxy typically sets to handle light pressure in a few hours and reaches stronger cure over 24–48 hours. For best results, clean and dry the repair area thoroughly and avoid extreme cold or wet conditions during initial cure.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSurface must be clean, dry and roughened with included sandpaper.\u003c\/li\u003e\n  \u003cli\u003eAllow initial set time before subjecting the repair to coolant pressure.\u003c\/li\u003e\n  \u003cli\u003eWarm, dry conditions accelerate cure; cold slows it down.\u003c\/li\u003e\n  \u003cli\u003eFollow the included instructions for mixing and layering the fiberglass.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan this kit be used on other parts besides radiators?\u003c\/h3\u003e\n\u003cp\u003eYes—the components bond to a wide range of materials, making the kit useful for washer tanks, water storage containers, PVC, composites and some plastics. It’s a handy multipurpose repair pack for motorcycles, ATVs, small engines and household tanks where a routed patch is acceptable.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with many plastics, composites and common metals.\u003c\/li\u003e\n  \u003cli\u003eUseful for automotive, marine and light-farm repairs.\u003c\/li\u003e\n  \u003cli\u003eNot a substitute for replacing parts in high-pressure industrial systems.\u003c\/li\u003e\n  \u003cli\u003eAlways test adhesion on an inconspicuous area if unsure of substrate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The J-B Weld 2120 Radiator Repair Kit is tailored for DIY mechanics, home enthusiasts and professional technicians who need a practical, on-vehicle solution for small radiator and plastic tank leaks. If you want a portable kit that provides reinforced patches for common cooling-system damage without immediate replacement, this product gives the tools and materials to perform reliable, long-lasting repairs when used as directed.\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: Will this kit work on metal radiator tanks?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The kit bonds to many metal surfaces as well as plastic, provided the area is properly cleaned and sanded before application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How long before I can refill and run the engine?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Light handling is usually possible after a few hours, but allow 24–48 hours for a stronger cure before full operating pressure.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"J-B Weld","offers":[{"title":"Default Title","offer_id":55165560619351,"sku":"B01IOPE66G","price":31.56,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/jb-weld-2120-front-packaging.jpg?v=1790355561","url":"https:\/\/britishgarage.co.uk\/products\/j-b-weld-radiator-repair-kit-2120-3-8-hole-4-crack-patch-epoxy-putty-with-fiberglass-cloth","provider":"British Garage","version":"1.0","type":"link"}