{"product_id":"crc-k-w-block-seal-permanent-metallic-16-oz-engine-radiator-leak-repair-metal-strength-bond","title":"CRC K\u0026W Block Seal Permanent Metallic 16 oz – Engine \u0026 Radiator Leak Repair, Metal‑strength Bond","description":"\u003cp\u003e\u003cstrong\u003eCRC K\u0026amp;W 401016 Block Seal Permanent Metallic™ is a professional-grade 16 oz coolant system sealer that forms a metal-strength molecular bond to permanently seal cracks, holes and leaks in engine blocks, heads, radiators and heater cores.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis concentrated formula was developed to repair cooling-system breaches in both gasoline and diesel engines without welding or part replacement in many cases. Independently lab-tested and designed to resist flow and breakdown under high temperature and pressure, it works on cast iron and aluminum blocks as well as copper, aluminum and bi-material radiators. Use it as a fast, shop-quality repair option when a temporary stopgap won’t do.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this product repair a cracked engine block or head gasket?\u003c\/h3\u003e\n\u003cp\u003eThe sealant creates a durable, molecular-level bond that locks into metal surfaces, filling and reinforcing damaged areas rather than just coating them. It hardens into a metallic-like seal that resists coolant flow and pressure, helping to stop active leaks.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eForms a permanent molecular bond that mimics steel-strength adhesion\u003c\/li\u003e\n  \u003cli\u003ePours into and fills cracks, cavities and gasket breaches\u003c\/li\u003e\n  \u003cli\u003eWorks on both cast iron and aluminum engine components\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill it hold up under high temperatures and coolant flow?\u003c\/h3\u003e\n\u003cp\u003eYes — the formula is engineered to withstand the extreme heat, pressure and continuous coolant circulation found in modern engines. It’s designed not to break down or wash away once cured, making it suitable for long-term service.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eStable under high temperature and pressure conditions\u003c\/li\u003e\n  \u003cli\u003eResists dissolution in circulating coolant\u003c\/li\u003e\n  \u003cli\u003eMeets professional standards for durability in cooling systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich vehicle systems and materials are compatible with this sealant?\u003c\/h3\u003e\n\u003cp\u003eIt’s formulated for broad compatibility across water-cooled systems. Use it on engine blocks, head gaskets, freeze plugs, radiators and heater cores made from common automotive metals and bi-material constructions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEffective on cast iron and aluminum engine blocks\u003c\/li\u003e\n  \u003cli\u003eSeals copper, aluminum and mixed-material radiators and heater cores\u003c\/li\u003e\n  \u003cli\u003eSuitable for both diesel and gasoline cooling systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow is the product applied and what should I expect after treatment?\u003c\/h3\u003e\n\u003cp\u003eApplication is straightforward: add the recommended amount to the coolant reservoir or radiator per the instructions, run the engine to circulate, and allow the formula to locate and seal leaks. Results can be immediate for small leaks; stubborn or large damage may require repeated treatments or complementary repairs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePour measured dose into coolant system as directed\u003c\/li\u003e\n  \u003cli\u003eRun engine to circulate sealant to leakage points\u003c\/li\u003e\n  \u003cli\u003eInspect and, if necessary, repeat or follow up with mechanical repair\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: CRC K\u0026amp;W 401016 Permanent Metallic™ Block \u0026amp; Radiator Seal is aimed at professional technicians, fleet maintenance shops and experienced DIYers who need a high-strength, lab-tested sealing solution for cooling-system leaks. It’s ideal when welding, part replacement or teardown are impractical, when downtime must be minimized, or when a lasting repair is preferred over temporary additives.\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 this sealant fix a blown head gasket?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It can seal many gasket leaks by filling and bonding the damaged area, but severe failures may still need mechanical repair.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is it compatible with all coolant types?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, it is formulated for use in all water-cooled gasoline and diesel systems with standard engine coolants.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"CRC","offers":[{"title":"Default Title","offer_id":48084394803358,"sku":"B000CIPV5E","price":25.68,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/crc-kw-401016-front-label.jpg?v=1785853492","url":"https:\/\/northtrailauto.ca\/products\/crc-k-w-block-seal-permanent-metallic-16-oz-engine-radiator-leak-repair-metal-strength-bond","provider":"North Trail Auto","version":"1.0","type":"link"}