{"product_id":"k-seal-st3501-head-gasket-sealer-16-oz-pour-go-seals-blown-gaskets-cracked-heads-ceramic-micro-fibres","title":"K-Seal ST3501 Head Gasket Sealer 16 oz Pour \u0026 Go — Seals Blown Gaskets \u0026 Cracked Heads, Ceramic Micro‑fibres","description":"\u003cp\u003e\u003cstrong\u003eK-Seal ST3501 Pour \u0026amp; Go Head Gasket Sealer (16 oz) is a ready-to-use engine coolant stop-leak that seals blown head gaskets, cracked heads and porous engine blocks without disassembly.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen a coolant leak threatens your engine, the ST3501 bottle offers a fast, simple repair option. The formula builds on K-Seal's proven chemistry with 33% more sealing power than the regular formula and ceramic micro-fibres designed to lodge into holes and form a durable seal. It’s packaged as a 16 oz pour‑and‑go treatment that mixes with the coolant system, letting you address leaks without removing the head or taking the vehicle out of service for extended repairs.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this product actually stop a blown head gasket?\u003c\/h3\u003e\n\u003cp\u003eThe ST3501 works by circulating with the coolant where ceramic micro-fibres and reactive polymers locate the leak and establish a flexible, long‑lasting barrier. It is formulated to find holes, cracks and porous metal and then bond to the metal surface to block coolant escape while still allowing normal heat transfer.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eContains ceramic micro-fibres that lodge into gaps up to 0.64 mm wide.\u003c\/li\u003e\n  \u003cli\u003eReactive polymers cure in the cooling circuit to form a resilient seal.\u003c\/li\u003e\n  \u003cli\u003eBlend is engineered for use without dismantling the cylinder head.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill it work with my vehicle’s coolant and engine materials?\u003c\/h3\u003e\n\u003cp\u003eK-Seal ST3501 is compatible with all common engine coolants and a wide range of engine metals and alloys used in cars, light trucks and some heavy‑duty machinery. That versatility makes it a useful option for mixed fleets or older vehicles with unknown coolant histories.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSafe with traditional and extended-life antifreezes.\u003c\/li\u003e\n  \u003cli\u003eFormulated to work with cast iron, aluminium and other engine block materials.\u003c\/li\u003e\n  \u003cli\u003eSuitable for many passenger vehicles and some heavy-duty applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I use the 16 oz pour-and-go bottle for best results?\u003c\/h3\u003e\n\u003cp\u003eUsing ST3501 is straightforward: add the bottle to a warm, but not hot, cooling system and allow the engine to idle or be driven gently to circulate the product. Follow the product instructions if you see bubbling in the radiator or reservoir; bubbling can indicate an over-pressurized system and may require specific steps to release pressure and improve sealing performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAdd to a warm system per label directions and run engine to circulate the formula.\u003c\/li\u003e\n  \u003cli\u003eMonitor coolant level and temperature while the product works.\u003c\/li\u003e\n  \u003cli\u003eConsult technical guidance if persistent bubbling or pressure issues occur.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat kinds of leaks and damage can this sealer repair?\u003c\/h3\u003e\n\u003cp\u003eST3501 is designed to address leaking head gaskets, small cracks in cylinder heads, and porous or cracked engine blocks where coolant is escaping. It’s not a substitute for mechanical repairs in every case, but it can eliminate the need for immediate disassembly in many common coolant leak scenarios.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEffective on blown or leaking head gaskets where coolant loss is present.\u003c\/li\u003e\n  \u003cli\u003eSeals small cracks in heads and micro‑porosity in blocks up to 0.64 mm.\u003c\/li\u003e\n  \u003cli\u003eUseful as a temporary or long‑term fix depending on damage severity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: K-Seal ST3501 is aimed at vehicle owners, fleet managers and mechanics who need a fast, user-friendly coolant stop‑leak option to avoid immediate head removal. It suits cars and light trucks with coolant leaks, older vehicles with uncertain maintenance histories, and operators of heavy equipment that require downtime reduction. For severe structural damage or persistent overheating, pair the product with professional diagnosis to determine whether mechanical overhaul is necessary.\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 ST3501 fix any blown head gasket?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It can seal many blown head gaskets and small cracks up to 0.64 mm, but severe mechanical damage may still require head removal and repair.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is ST3501 compatible with my car’s coolant?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—ST3501 works with all common coolants and many engine materials, but follow label instructions for best results.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"K-Seal","offers":[{"title":"Default Title","offer_id":48087512449182,"sku":"B00QYZIVA6","price":38.77,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/k-seal-st3501-front-packaging.jpg?v=1785925095","url":"https:\/\/northtrailauto.ca\/products\/k-seal-st3501-head-gasket-sealer-16-oz-pour-go-seals-blown-gaskets-cracked-heads-ceramic-micro-fibres","provider":"North Trail Auto","version":"1.0","type":"link"}