--- product_id: 47965946 title: "Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks, 472ml" brand: "k-seal" price: "£43.43" currency: GBP in_stock: true reviews_count: 13 category: "K Seal" url: https://www.desertcart.co.uk/products/47965946-ultimate-head-gasket-and-block-repair-seal-and-fix-coolant store_origin: GB region: United Kingdom --- # Permanent lifetime fix 33% more sealing power Seals leaks up to 0.64mm Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks, 472ml **Brand:** k-seal **Price:** £43.43 **Availability:** ✅ In Stock ## Summary > 🚗 Seal the deal with K-Seal Ultimate — never let a leak slow your drive! ## Quick Answers - **What is this?** Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks, 472ml by k-seal - **How much does it cost?** £43.43 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/47965946-ultimate-head-gasket-and-block-repair-seal-and-fix-coolant) ## Best For - k-seal enthusiasts ## Why This Product - Trusted k-seal brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **One-Step Leak Lock:** Ceramic micro-fibres seal holes and cracks up to 0.64mm without engine downtime. - • **Effortless Application:** No draining or flushing needed—just shake, pour, and drive on. - • **Permanent Engine Savior:** Advanced formula delivers 33% more sealing power than standard K-Seal for a lasting repair. - • **Universal Compatibility:** Works seamlessly with all coolant types and engine materials, including heavy-duty machinery. - • **Mechanic-Trusted Reliability:** Independently tested and trusted worldwide for durable, cost-effective head gasket and block repairs. ## Overview K-Seal Ultimate is a professional-grade, permanent head gasket and engine block repair fluid that offers 33% more sealing power than regular formulas. It permanently seals leaks up to 0.64mm using ceramic micro-fibres, requires no engine draining or flushing, and is compatible with all coolant types and engine materials. Trusted by mechanics worldwide and independently verified, it provides a cost-effective, long-lasting solution to engine leaks. ## Description From the brand Review: Worked with heavily modified car, temp fix. - The product works great, had to unfortunately use it on my stage 3 3l a5 diesel. Temporary fix, While while I rebuild the engine, but it worked immediately, I have tried others, steel seal etc. None worked except this, however, I do believe it did damage the thermostat, but I can't say it definitely was this. Recommend. Review: Works really well - Works really well. Just make sure you really warm the engine fully. Great item. Fast delivery. Well packaged. Highly recommended 100% good ## Features - Causes serious eye irritation. - Harmful to aquatic life with long lasting effects. - PERMANENT REPAIR: Our advanced formula with 33% more sealing power than regular K-Seal, ensures a long-lasting, permanent seal for challenging leaks. Permanently fixes blown head gaskets, cracked heads & porous engine blocks in cars. - STOP HOLES & CRACKS: With just 1 step our unique formula with ceramic micro-fibres, will permanently seal leaks up to 0.64mm in size, without any adverse impact on the engine. - EASY TO USE: It requires no draining or flushing; just shake, pour & go - shake the bottle, add the fluid wherever you top up your coolant & run your engine as normal. For larger engines (HGV's / Plant) use 2 bottles. - VERSATILE COMPATIBILITY: Works with all types of coolant & compatible with a wide range of vehicle engine materials & heavy duty machinery. A permanent fix for the lifetime of the engine. - PROFESSIONAL-GRADE RELIABILITY: Trusted by mechanics, our sealer treatment delivers a durable & long-lasting repair. A cost-effective head gasket & block repair, enhancing the performance of your vehicle’s cooling system. We've sold millions worldwide & are independently verified by university testing to meet ASTM D3147. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00Q55SV6O | | Best Sellers Rank | 4,741 in Automotive ( See Top 100 in Automotive ) 64 in Fillers, Adhesives & Sealants | | Brand | K-Seal | | Customer Reviews | 3.8 3.8 out of 5 stars (595) | | Global Trade Identification Number | 05060002968109 | | Included Components | 1 Bottle | | Item Shape | Round | | Item Type Name | Head Gasket Repair | | Manufacturer | K-Seal International Limited | | Manufacturer Part Number | KSLST3501 | | Model Number | KSLST3501 | | Product Warranty | 1 year manufacturer | ## Product Details - **Brand:** K-Seal - **Global Trade Identification Number:** 05060002968109 - **Manufacturer:** K-Seal International Limited - **Number of items:** 1 - **Shape:** Round ## Images ![Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks, 472ml - Image 1](https://m.media-amazon.com/images/I/71G83KAp7FL.jpg) ## Questions & Answers **Q: Hi, just to makes sure, i have vauxhall corsa, coolant's leaked into the engine oil, will this work? many thanks** A: I am afraid this is a problematic symptom of a head gasket failure to repair as this is liquid to liquid. We also state that K-Seal is not suitable for coolant to oil or oil to coolant leaks and so any attempt to solve this would be the best efforts only endeavour. **Q: My volkswagen 1.9 tdi transporter is leaking exhaust gasses into the cooling system and thus over pressuring the system, will this product cure issue?** A: If the crack in the head thats causing the problems is absolutely tiny then it may fix your problem but if it's larger than a millimetre or something like that which it states on the bottle somewhere then no it wont fix the problen and unfortunately you'll have to get another head either main Stelar or eBay or something like that... **Q: I have oil leaking from the engine (v old citroen saxo). will this fix it? is it the right product?** A: No it will not stop an oil leak. It is designed to go in the coolant system and stop head gasket leaks emitting from the coolant system. If you have oil leaking from the engine at the head gasket you need the cylinder head skimming and the block re-building. If you have oil leaking for elsewhere on the engine, that will need taking apart and rebuilding with new gaskets. **Q: Have a bmw x5 4.8is v8 petrol. am losing water but only a tiny bit - have used one of these 2 weeks ago not cured - do i need 2 given engine size?** A: Hi, no there is no need to use another bottle as K-Seal is calculated by coolant capacity and not engine CC capacity. It is more likely that the leak is so small that the particles are not being drawn out of the cooling system. This is just a case of waiting a little longer for this to happen but I recommend that the engine is run for 15 - 20 mins each day if the car is not used on a regular basis. You can also email me directly if that is easier to info@kseal.com FAO Colin. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Worked with heavily modified car, temp fix. *by A***R on 1 March 2023* The product works great, had to unfortunately use it on my stage 3 3l a5 diesel. Temporary fix, While while I rebuild the engine, but it worked immediately, I have tried others, steel seal etc. None worked except this, however, I do believe it did damage the thermostat, but I can't say it definitely was this. Recommend. ### ⭐⭐⭐⭐⭐ Works really well *by G***N on 17 January 2026* Works really well. Just make sure you really warm the engine fully. Great item. Fast delivery. Well packaged. Highly recommended 100% good ### ⭐⭐⭐⭐ This will work for some applications *by P***1 on 16 February 2024* But in my case it did not work fully. I think it reduced the problem somewhat but I can't dismiss it entirely as I can't be certain what was causing my problem. At the price, it's got to be worth a try. ## Frequently Bought Together - K-Seal Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks, 472ml - K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required --- ## 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.co.uk/products/47965946-ultimate-head-gasket-and-block-repair-seal-and-fix-coolant](https://www.desertcart.co.uk/products/47965946-ultimate-head-gasket-and-block-repair-seal-and-fix-coolant) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-18*