--- product_id: 47965946 title: "K-Seal Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks, 472ml" brand: "k-seal" price: "€ 82.04" currency: EUR in_stock: true reviews_count: 13 category: "K Seal" url: https://www.desertcart.hr/products/47965946-k-seal-ultimate-head-gasket-and-block-repair-seal-fix store_origin: HR region: Croatia --- # works with all coolant types ceramic micro-fibres formula 33% more sealing power K-Seal Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks, 472ml **Brand:** k-seal **Price:** € 82.04 **Availability:** ✅ In Stock ## Summary > 🛠️ Seal the deal, skip the downtime! ## Quick Answers - **What is this?** K-Seal Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks, 472ml by k-seal - **How much does it cost?** € 82.04 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/47965946-k-seal-ultimate-head-gasket-and-block-repair-seal-fix) ## 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 - • **Trusted by Pros:** Mechanic-approved and ASTM D3147 verified for reliable, long-lasting engine repairs. - • **Permanent Leak Fix:** Advanced formula seals leaks up to 0.64mm permanently, no more temporary patches. - • **One-Step Application:** Shake, pour, and drive—no draining or flushing needed, saving you time and hassle. - • **Universal Compatibility:** Seamlessly works with all coolant types and engine materials, from cars to heavy machinery. - • **Cost-Effective Engine Savior:** Avoid costly repairs with a proven, budget-friendly solution that keeps you on the road. ## Overview K-Seal Ultimate is a professional-grade head gasket and engine block repair fluid that delivers 33% more sealing power than standard formulas. Its unique ceramic micro-fibre technology permanently seals leaks up to 0.64mm without engine flushing, compatible with all coolant types and engine materials. Trusted worldwide and independently verified, it offers a cost-effective, long-lasting fix for blown head gaskets, cracked heads, and porous blocks—perfect for millennial professionals who demand reliability and efficiency. ## Description Product Description 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: worked a treat for me !! - My trusty 1996 Diesel car of 17 years had to be sold due to the stupid and criminal extension of ULEZ (extended outside of the A406, by the London Mayor). Unfortunately the replacement vehicle I bought (it wasn't obvious at first) had a suspect blown head gasket , I thought the slight oil in the coolant was due to lack of maintenance/servicing by the previous owner & the broken seals on the oil cooler - there were no other head failure gasket symptoms . Also a co2 head tester test showed negative to head gasket issues. 6 months after the purchase, the oil management light came on. Diagnostics showed cylinder 2 misfiring. I replaced all the spark plus & ignition coils, the light disappeared for a day , but came back again. My local garage took out the spark plug to cylinder 2 & used some sort of Otoscope to peer into the cylinder and saw coolant in there. He recommended K-seal. I read reviews and results seem to be 50/50, (I presume it depends on the seriousness of the gasket damage, how successful this treatment will be) . But for my Nissan Xtrail 2.5 litre Petrol engine this worked a treat. No vibrating when i started the car, the car ran smoothly. Whether K-Seal would last for a long time, I cant say, I had a road trip planned and wasnt going to risk it, but definitely as a stop gap till i got another car, this worked brilliantly. Its a gamble, but even for the price (£32) I would definitely sue this product again as a stop gab or to get me out of a tricky situation ie getting home rather than being stranded. As for the long term issues with having this in your engine, some say its ok, some say its not great for the cooler system, but for an older car my feeling would be 'why not use it, especially as a stop gab. ## 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 | 3,419 in Automotive ( See Top 100 in Automotive ) 54 in Fillers, Adhesives & Sealants | | Brand | K-Seal | | Customer Reviews | 3.8 out of 5 stars 600 Reviews | | 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 | | Number of items | 1 | | Product Warranty | 1 year manufacturer | | Shape | Round | ## Product Details - **Brand:** K-Seal - **Global Trade Identification Number:** 05060002968109 - **Manufacturer:** K-Seal International Limited - **Number of items:** 1 - **Shape:** Round ## Images ![K-Seal Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks, 472ml - Image 1](https://m.media-amazon.com/images/I/71G83KAp7FL.jpg) ![K-Seal Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks, 472ml - Image 2](https://m.media-amazon.com/images/I/81ExIuiXz-L.jpg) ![K-Seal Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks, 472ml - Image 3](https://m.media-amazon.com/images/I/81fjpE+5DfL.jpg) ![K-Seal Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks, 472ml - Image 4](https://m.media-amazon.com/images/I/810oKVSrG3L.jpg) ![K-Seal Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks, 472ml - Image 5](https://m.media-amazon.com/images/I/8133FJ18BQL.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. ### ⭐⭐⭐⭐⭐ worked a treat for me !! *by D***R on 18 July 2024* My trusty 1996 Diesel car of 17 years had to be sold due to the stupid and criminal extension of ULEZ (extended outside of the A406, by the London Mayor). Unfortunately the replacement vehicle I bought (it wasn't obvious at first) had a suspect blown head gasket , I thought the slight oil in the coolant was due to lack of maintenance/servicing by the previous owner & the broken seals on the oil cooler - there were no other head failure gasket symptoms . Also a co2 head tester test showed negative to head gasket issues. 6 months after the purchase, the oil management light came on. Diagnostics showed cylinder 2 misfiring. I replaced all the spark plus & ignition coils, the light disappeared for a day , but came back again. My local garage took out the spark plug to cylinder 2 & used some sort of Otoscope to peer into the cylinder and saw coolant in there. He recommended K-seal. I read reviews and results seem to be 50/50, (I presume it depends on the seriousness of the gasket damage, how successful this treatment will be) . But for my Nissan Xtrail 2.5 litre Petrol engine this worked a treat. No vibrating when i started the car, the car ran smoothly. Whether K-Seal would last for a long time, I cant say, I had a road trip planned and wasnt going to risk it, but definitely as a stop gap till i got another car, this worked brilliantly. Its a gamble, but even for the price (£32) I would definitely sue this product again as a stop gab or to get me out of a tricky situation ie getting home rather than being stranded. As for the long term issues with having this in your engine, some say its ok, some say its not great for the cooler system, but for an older car my feeling would be 'why not use it, especially as a stop gab. ### ⭐ Did not work for me *by K***X on 23 December 2019* Head gasket started to leak on my Mercedes Sprinter, gasket was not leaking directly but radiator pressurising when engine under heavy load causing water to be expelled through radiator pressure relief cap, (cap tested and found to be in good condition) I purchased a radiator pressure tester to check for leaks and found none, tester would hold pressure over night so came to conclusion that head gasket must be starting to leak under load. Thought I would try Kalimex head gasket sealer as it stated that this was one of the problems it could perminamtley fix, £30 per bottle later I added the Kalimex as per instructions, set off on test drive, 5 miles later water level was low again, product did not work. Am now sending for refund as per guarantee. ## 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.hr/products/47965946-k-seal-ultimate-head-gasket-and-block-repair-seal-fix](https://www.desertcart.hr/products/47965946-k-seal-ultimate-head-gasket-and-block-repair-seal-fix) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-06-24*