--- product_id: 47966303 title: "Wynn's Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - 325ml" brand: "wynn's" price: "¥2503" currency: JPY in_stock: true category: "Wynn's" url: https://www.desertcart.jp/products/47966303-wynns-radiator-stop-leak-seals-radiator-and-head-gasket-leaks store_origin: JP region: Japan --- # Prevents overheating & corrosion Safe for all cooling parts Seals small leaks fast Wynn's Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - 325ml **Brand:** wynn's **Price:** ¥2503 **Availability:** ✅ In Stock ## Summary > 🛠️ Seal the deal, drive with confidence! ## Quick Answers - **What is this?** Wynn's Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - 325ml by wynn's - **How much does it cost?** ¥2503 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/47966303-wynns-radiator-stop-leak-seals-radiator-and-head-gasket-leaks) ## Best For - wynn's enthusiasts ## Why This Product - Trusted wynn's brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Coolant Harmony:** Compatible with all antifreeze types including OAT fluids for worry-free use - • **Corrosion Defense:** Guards metal parts against rust for longer engine life - • **Leak-Proof Confidence:** Stops radiator & head gasket leaks without hassle - • **System-Friendly Formula:** Protects rubber hoses, gaskets & sensors—no clogging, no damage - • **Universal Engine Compatibility:** Works seamlessly with petrol, diesel & LPG water-cooled engines ## Overview Wynn's Radiator Stop-Leak is a 325ml advanced sealing liquid designed to quickly and safely fix small leaks in radiators, cooling systems, and head gaskets. Its unique formula protects rubber and metal components, prevents clogging, and guards against corrosion and rust. Compatible with all coolant types and suitable for petrol, diesel, and LPG engines, it ensures optimal engine temperature and long-term system reliability. ## Description Product Description This high-performance sealing product is specially designed to stop small leaks in the radiator, cooling, and heating systems, ensuring reliable and long-lasting engine operation. Formulated to prevent coolant loss, it helps maintain the engine at optimal temperature levels while minimising the risk of overheating. By sealing leaks in the head gasket and other system components, it extends the life of the cooling system and helps prevent costly repairs. Unlike some sealants that can be abrasive or cause clogging, this formulation is carefully designed to be safe for all parts of the cooling system. Developed to work without harming rubber hoses, gaskets, or metal components, this product offers excellent compatibility with all standard antifreeze and coolant types, including OAT (organic acid technology) fluids. The advanced formula ensures that it does not create blockages within the system, keeping radiator waterways and temperature sensors free from obstructions. This feature allows for accurate temperature monitoring and optimal heat dissipation, preventing further engine issues. In addition to sealing leaks, this product provides enhanced protection against corrosion and rust. By forming a protective barrier inside the cooling system, it prevents the formation of rust and corrosion, which can lead to severe damage over time. This added layer of protection helps maintain the cooling system’s efficiency and ensures long-term reliability. Suitable for petrol, diesel, and LPG engines, this product is highly versatile and can be used in any "water" cooled engine system. It is recommended not only for addressing existing leaks but also as a preventive maintenance solution to avoid potential issues before they become severe. By reinforcing the cooling system’s integrity, it ensures that the vehicle remains in peak operating condition, providing peace of mind and long-lasting protection against leaks, corrosion, and overheating. Manufacturer's Description Wynns Radiator Stop Leak Compatible withnall coolants and anti-freeze. Radiator stop leak will seal small leaks without damage to rubber hoses , gaskets or other system components. Formulated to stop and prevent leaks in the radiator and cooling system , protect against rust and corrosion and to lubricate the water pump. Note . Radiator stop leak will not repair broken or split hoses. Size 325ml. ## Features - Contains 1,2-benzisothiazol-3(2H)-one. May produce an allergic reaction. - Safety data sheet available on request. - ✅ EFFECTIVE SEALING FOR SMALL LEAKS IN THE COOLING SYSTEM: Designed to address minor leaks efficiently, this advanced sealing product provides a quick and durable solution for cooling system issues. Its specialised formula effectively seals leaks in the radiator, cooling, and heating systems, as well as in the head gasket, ensuring optimal engine performance. The innovative composition prevents coolant loss, reducing the risk of overheating and potential engine damage. Unlike conventional sealants, this formula is developed to integrate seamlessly with existing coolant fluids, offering long-lasting protection without compromising system efficiency. - ✅ SAFE FOR RUBBER HOSES, GASKETS, AND SYSTEM COMPONENTS: Engineered with compatibility in mind, this sealant is safe for all components within the cooling system, including rubber hoses, gaskets, and metal parts. Its non-aggressive formulation ensures that seals and hoses maintain their flexibility and structural integrity over time. This protection helps extend the lifespan of cooling system parts, reducing maintenance costs and preventing premature wear. Additionally, the product is designed to work without causing deposits or blockages, keeping the cooling system functioning optimally. - ✅ PREVENTS CLOGGING AND ENSURES TEMPERATURE SENSOR ACCURACY: Unlike some sealing products that can lead to buildup and reduced efficiency, this formulation is designed to avoid clogging radiator waterways and temperature sensors. By maintaining proper coolant flow and accurate temperature readings, this product ensures that the engine operates within the ideal temperature range, preventing overheating or inefficiencies. Its compatibility with various antifreeze and coolant types makes it a versatile and reliable choice for ongoing maintenance and preventive care. - ✅ ENHANCED PROTECTION AGAINST CORROSION AND RUST: Offering more than just leak prevention, this product also provides enhanced protection against corrosion and rust. Exposure to heat, moisture, and coolant chemicals can lead to internal corrosion, weakening the system and leading to expensive repairs. This advanced formulation actively protects metal components from rust and corrosion, helping to maintain engine efficiency and prolong the lifespan of the cooling system. Its compatibility with OAT (organic acid technology) fluids and all standard antifreeze products ensures easy integration into any system. - ✅ VERSATILE APPLICATION FOR PETROL, DIESEL, AND LPG ENGINES: Ideal for all "water" cooled systems, this sealant is suitable for a wide range of engine types, including petrol, diesel, and LPG. It is recommended not only for repairing minor leaks but also as a preventive solution to avoid potential issues before they escalate into costly repairs. By reinforcing the integrity of the cooling system, this product helps maintain vehicle reliability and performance under various driving conditions. Whether used for routine maintenance or emergency repairs, it offers an effective and lasting solution for cooling system leaks. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000297UG6 | | Best Sellers Rank | 764 in Automotive ( See Top 100 in Automotive ) 22 in Antifreeze & Coolants | | Brand | Wynn's | | Colour | _ | | Compatible Material | Aluminium, Metal, Plastic | | Country Of Origin | United Kingdom | | Customer Reviews | 4.3 4.3 out of 5 stars (2,168) | | Global Trade Identification Number | 05411693558641 | | Item Dimensions | 4 x 22 x 83 millimetres | | Item Form | Liquid | | Item Highlight | Prevents Corrosion & Rust - Compatible with All Coolants/Antifreeze & OAT Fluids - Safe for Hoses & Sensors | | Item Type Name | Radiator Stop Leak | | Item Weight | 0.36 Kilograms | | Manufacturer | Wynn Oil UK | | Manufacturer Part Number | 55864 | | Material | Rubber | | Model Number | WY55864 | | Number of Items | 1 | | Number of Packs | 1 | | Style Name | Compact | | Surface Recommendation | Metals and alloys commonly found in automotive cooling systems (e.g., aluminum, steel) | | Unit Count | 325.0 millilitre | | Water Resistance Level | Water Resistant | ## Product Details - **Brand:** Wynn's - **Item dimensions L x W x H:** 4 x 22 x 83 millimetres - **Item weight:** 0.36 Kilograms - **Material:** Rubber - **Style:** Compact ## Images ![Wynn's Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - 325ml - Image 1](https://m.media-amazon.com/images/I/619bQiniwdL.jpg) ## Questions & Answers **Q: Do you just add to radiator whilst full or do you have to drain radiator first ?** A: If your radiator is full,then it sounds like you don't need it. But if you can't see the water, then pour the stuff in and top up with water. Then away you go. Don't forget to check later on. **Q: What colour liquid is this please ? Will it change the coolant colour. thx** A: No, it won't change the coolant colour - it's the colour (and texture) of wallpaper paste **Q: Hi will this work on my heater core ?** A: Not sure - I think it would depend where in the core the leak is and what material it's made from (so probably unlikely to work with plastic components or leaks from pipe attachment points, for example). But considering how difficult most heaters are to replace it's got to be worth a try. **Q: Could this be used for central heating as I have small drip at bottom of radiator** A: Radiator stop leak is designed to mix with car coolant running at much higher temperatures than domestic boilers. Plus the mix ratio would be out. Wouldn't know how many litres of water in heating system. Can understand why hypothetically it could work but don't try it. If its an emergency fix try using CT1 sealant on the external section where leak is on radiator if you can see it. (Not in the radiator!) ## Frequently Bought Together - Wynns Radiator Stop Leak 325ml - Wynn's 28263 Diesel Particulate Filter Cleaner - #1 DPF foam cleaner Diesel particulate filter without disassembling easy to use Latest cleaning technology cleaner --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/47966303-wynns-radiator-stop-leak-seals-radiator-and-head-gasket-leaks](https://www.desertcart.jp/products/47966303-wynns-radiator-stop-leak-seals-radiator-and-head-gasket-leaks) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-10-08*