--- product_id: 48499169 title: "K-Seal HD" brand: "k-seal" price: "€ 40.88" currency: EUR in_stock: true reviews_count: 13 category: "K Seal" url: https://www.desertcart.ie/products/48499169-k-seal-hd store_origin: IE region: Ireland --- # Permanent fix for heavy-duty engines Seals leaks in minutes Compatible with all antifreeze types K-Seal HD **Brand:** k-seal **Price:** € 40.88 **Availability:** ✅ In Stock ## Summary > 🚗 Seal it, forget it, and keep your engine cool like a pro! ## Quick Answers - **What is this?** K-Seal HD by k-seal - **How much does it cost?** € 40.88 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/48499169-k-seal-hd) ## 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 - • **Proven & Trusted:** Millions sold globally, independently verified to meet ASTM D3147 standards. - • **Rapid Leak Sealing:** Fixes radiator, head gasket & more in just one step—no draining needed. - • **Non-Corrosive Formula:** Protects your cooling system without clogging or damage—trusted by mechanics worldwide. - • **Heavy-Duty Engine Ready:** Engineered for commercial & agricultural vehicles with industrial strength reliability. - • **Universal Coolant Compatibility:** Works seamlessly with all antifreeze types to keep your engine running cool. ## Overview K-Seal HD is a professional-grade coolant leak repair solution designed for heavy-duty and industrial engines. It permanently seals leaks in radiators, head gaskets, freeze plugs, blocks, heater matrices, and water pumps within minutes without draining or flushing. Compatible with all antifreeze types, this non-corrosive formula is trusted by mechanics worldwide and independently tested to meet ASTM D3147 standards, ensuring long-lasting engine cooling system reliability. ## Description K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant : desertcart.co.uk: Automotive Review: Brilliant product - Does exactly what it says - leak fixed - I was having sudden major loss of coolant, discovered a leaky expansion tank previously and had already replaced tank, but problem then worsened! Couldn't see any obvious leaks from the radiator, and all hoses were sound, unlikely to be the water pump as the problem would have been worse, so likely a gasket or seal somewhere being the cause of the leak. Added 1 container of K-Seal HD, and within an hour or so of the engine getting up to temperature, the leak was fixed with no further loss of coolant. I have put over 3000 miles on the car since adding K-Seal, and no further loss of coolant. Car is Audi A6 Allroad 3.0 V6 Diesel with c.100,000 miles on the clock. Bought another K-Seal to keep in the boot - just in case! Review: Always the go to item! - Ceramic & copper filaments binding well to stop leaks, works with all antifreeze types takes time to stop leaks so be patient..unless you have gaping holes, it will work ## Features - Causes serious eye irritation. - Contains 5-chloro-2-methyl-4-isothiazolin-3-one [EC no. 247-500- 7] and 2-methyl-4-isothiazolin-3-one [EC no. 220-239-6] (3:1). May produce an allergic reaction. - May cause an allergic skin reaction. - Toxic to aquatic life with long lasting effects. - FIX IT FAST: Our multi-purpose solution works in minutes to quickly & permanently seal leaks in the radiator, head gasket, freeze plugs, block, heater matrix & water pump of heavy duty vehicles. Fixes most leaks in water-cooled engines. - STOP HOLES & CRACKS: With 1 step our unique formula will seek out each hole & crack, permanently sealing them, without any adverse impact on the efficiency of your engine cooling. - EASY TO USE: K-Seal couldn't be simpler & requires no draining or flushing; just shake, pour & go - shake the bottle, add the fluid to your coolant system & run your engine as normal. - HEAVY DUTY PERFORMANCE: Engineered for large engines & industrial use; suitable for commercial or agricultural vehicles. A permanent repair for the lifetime of the engine. Compatible with all types of antifreeze coolant. - PROFESSIONAL-GRADE RELIABILITY: Trusted by mechanics, our non-corrosive sealer delivers a durable & long-lasting repair, without clogging your cooling system. A cost-effective solution to engine coolant leaks, enhancing the reliability & 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 | B004W6I7MQ | | Best Sellers Rank | 3,511 in Automotive ( See Top 100 in Automotive ) 51 in Fillers, Adhesives & Sealants | | Brand | K-Seal | | Customer Reviews | 4.3 4.3 out of 5 stars (520) | | Date First Available | 26 Mar. 2010 | | Delivery information | We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout. | | Item Weight | 520 g | | Item model number | K5516 | | Manufacturer | K-Seal International Limited | | Manufacturer part number | K5516 | | Model | K-Seal HD Coolant Leak Repair | | Package Dimensions | 19.3 x 10.67 x 4.83 cm; 520 g | ## Images ![K-Seal HD - Image 1](https://m.media-amazon.com/images/I/81WGgS5sAlL.jpg) ## Questions & Answers **Q: Can this product be used on Marine Diesel engines ?** A: Did this help your marine engine? I’ve a suspect head gasket / maybe a cracked block **Q: can this be used in a central heating system with large volumes of water/coolant? and is it heat curing or air curing?** A: Yes it can be used in a central heating system it will last for about two months. **Q: What colour is it please** A: Clear I think, be very careful using g this product it costs me several hundred pounds to put car right, it didn't stop leak but the tiny molecules gold color completed blocked my heating system took several back flushes to unblock and replace sensors in top up tank completely clogged the sensor points set hard. Still traces if it now in coolant 3 months on **Q: Do you need to remove some coolant before putting in. I have a tiny drop but the sensor keeps going off?** A: Not unless it’s totally full no. If you’re on empty this whole bottle will only fill a tiny bit of your system. Check your vehicle handbook for how much coolant it takes to fill your system and calculate what the difference is, then you will know what the bottle will fill without risking overflow or damage from excess fluid. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Brilliant product - Does exactly what it says - leak fixed *by C***E on 18 November 2023* I was having sudden major loss of coolant, discovered a leaky expansion tank previously and had already replaced tank, but problem then worsened! Couldn't see any obvious leaks from the radiator, and all hoses were sound, unlikely to be the water pump as the problem would have been worse, so likely a gasket or seal somewhere being the cause of the leak. Added 1 container of K-Seal HD, and within an hour or so of the engine getting up to temperature, the leak was fixed with no further loss of coolant. I have put over 3000 miles on the car since adding K-Seal, and no further loss of coolant. Car is Audi A6 Allroad 3.0 V6 Diesel with c.100,000 miles on the clock. Bought another K-Seal to keep in the boot - just in case! ### ⭐⭐⭐⭐⭐ Always the go to item! *by T***M on 24 August 2025* Ceramic & copper filaments binding well to stop leaks, works with all antifreeze types takes time to stop leaks so be patient..unless you have gaping holes, it will work ### ⭐⭐⭐⭐ Ian *by I***N on 21 December 2025* Did the job but I’ve lost heat in the heater matix ## Frequently Bought Together - K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant - PRESTONE PAFR0035B Coolant Antifreeze for All Vehicles 10 year 300,000 miles Corrosion Protection, Ready to Use, 1 Litre --- ## 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.ie/products/48499169-k-seal-hd](https://www.desertcart.ie/products/48499169-k-seal-hd) --- *Product available on Desertcart Ireland* *Store origin: IE* *Last updated: 2026-07-08*