--- product_id: 267704249 title: "ST5501 Multi Purpose 1 Step Permanent Coolant Leak | Radiator Leak Repair for Car RV Truck Motorcycle Sealant for Cylinder Head, Engine Block & Water Pump" brand: "k-seal" price: "$42.18" currency: USD in_stock: true reviews_count: 13 category: "K Seal" url: https://www.desertcart.us/products/267704249-st5501-multi-purpose-1-step-permanent-coolant-leak-radiator-leak store_origin: US region: United States of America --- # Universal compatibility Fast 20-minute fix Seals leaks up to 0.635 mm ST5501 Multi Purpose 1 Step Permanent Coolant Leak | Radiator Leak Repair for Car RV Truck Motorcycle Sealant for Cylinder Head, Engine Block & Water Pump **Brand:** k-seal **Price:** $42.18 **Availability:** βœ… In Stock ## Summary > πŸš— Seal the deal before your engine feels the heat! ## Quick Answers - **What is this?** ST5501 Multi Purpose 1 Step Permanent Coolant Leak | Radiator Leak Repair for Car RV Truck Motorcycle Sealant for Cylinder Head, Engine Block & Water Pump by k-seal - **How much does it cost?** $42.18 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/267704249-st5501-multi-purpose-1-step-permanent-coolant-leak-radiator-leak) ## 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 - β€’ **Proven & Trusted:** Millions of users and experts recommend K-Seal for dependable cooling system repairs - β€’ **Time & Cost Saver:** Avoid expensive repairs and downtime with a quick, reliable DIY solution - β€’ **Permanent Leak Seal:** Micro-ceramic & copper tech fixes cracks up to 0.635 mm without disassembly - β€’ **Effortless Application:** Just pour into a cold radiator or expansion tank and drive offβ€”no workshop needed - β€’ **Universal Compatibility:** Works seamlessly with all coolants and antifreeze across cars, trucks, boats & more ## Overview K-Seal ST5501 is a cutting-edge radiator sealant that permanently repairs leaks up to 0.635 mm using advanced micro-ceramic and copper technology. Compatible with all coolant types and vehicle models, it offers a fast, no-disassembly fix that saves time and costly repairs. Trusted by millions and recommended by professionals, it’s the ultimate DIY coolant leak solution. ## Description A leaky radiator, water loss or a defective cylinder head gasket can quickly lead to expensive repairs. But with K-Seal universal radiator sealant, leaks in the cooling circuit can be permanently and cost-effectively eliminated - without visiting a workshop. The innovative micro-ceramic and copper technology ensures that cracks and holes up to 0.635 mm are reliably sealed. The application is very simple: shake the bottle well, put the contents in the radiator or expansion tank (when the engine is cold), start the engine and go. K-Seal automatically distributes in the system and reliably seals leakage. The advantages at a glance: - Immediate and permanent repair of radiator and cylinder head gasket leaks - No elaborate disassembly required - simply place in the cooling system - Compatible with all coolants and antifreeze - Universal use for cars, motorcycles, trucks, boats, tractors and more - Tried and tested millions of times and recommended by experts and workshops. With K-Seal you save time, money and nerves - for a quick and reliable repair without great effort. Review: Excellent product. Works really well as advertised. - Excellent product. Worked wonders with my 2003 Volvo s60 with 261000 kms on the odometer. The engine head gasket had blown up causing water loss. K-seal sealed it in 20 minutes. After applying the fix I drove it for almost 100 kilometers and no water loss at all. Though I have to see how long it lasts. Six months since I used it and the car still runs great without issues. Review: Superb As described - I had a leak wasn't detectable, it drove me crazy, no white smoke and no sign of leak, every week i had to top up around 200ml coolant, even at garage wasn't found, and this little magic did stop the leak almsot a month and half no issue till end of July ++ Edit by August beginning Oil mixed with coolant , looks heat exchanger inner issue hop not followed by usage of this item!++ Edit Sep August End coolant pump stopped working, and thermostat and leak from Radiator after heat start to go up, unsure if system clogged, leak was mostly by Radiator damage but not visible because evaporated due engine heat and air flaw! ## Features - Seamless functionality - Compact construction - Packed with features - Unparalleled performance ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B001QT9KO6 | | Best Sellers Rank | #11,781 in Automotive ( See Top 100 in Automotive ) #84 in Oil & Fluid Additives | | Brand | K-Seal | | Brand Name | K-Seal | | Color | clear | | Compatible Material | Ceramic | | Customer Reviews | 4.2 out of 5 stars 12,960 Reviews | | Global Trade Identification Number | 05060002968017 | | Item Dimensions | 8.9 x 3.8 x 11.4 centimeters | | Item Form | Liquid | | Item Weight | 0.26 Kilograms | | Item dimensions L x W x H | 8.9 x 3.8 x 11.4 centimeters | | Item weight | 0.26 Kilograms | | Manufacturer | K-Seal | | Material | Resin | | Material Type | Resin | | Model | ST5501 | | Number of Items | 1 | | Number of Packs | 1 | | Part Number | ST5501 | | Style | radiator sealant | | Style Name | radiator sealant | | Supported Standards | ASTM D3147 | | Surface Recommendation | Vent, Countertop, Sink, Wall | | UPC | 367157659506 812646010004 | | Unit Count | 236 Milliliters | | Water Resistance Level | Water Resistant | | Water resistance level | Water Resistant | ## Product Details - **Brand:** K-Seal - **Item dimensions L x W x H:** 8.9 x 3.8 x 11.4 centimeters - **Item weight:** 0.26 Kilograms - **Material:** Resin - **Style:** radiator sealant ## Images ![ST5501 Multi Purpose 1 Step Permanent Coolant Leak | Radiator Leak Repair for Car RV Truck Motorcycle Sealant for Cylinder Head, Engine Block & Water Pump - Image 1](https://m.media-amazon.com/images/I/71fLFvkh6wL.jpg) ## Questions & Answers **Q: will this work for leakey gaskets?** A: It is designed to work on leaky gaskets. If you have a small leak this product might be an easy and cheap fix. It did not work for me. Perhaps my leak was too large. It is hard to tell. **Q: Does it discolor the antifreeze? Thanks** A: Unfortunately I can't say. I have a GM vehicle that uses the orangish color engine coolant and it and this product are so close in color it's hard to say if it would discolor the usual green-colored coolant found in non-GM vehicles. The other challenge is that I can only look at the coolant through an overflow reservoir and it's so dark when I look inside (I have to use an LED flashlight to see it adequately) that it would be hard to tell if there was any discoloration. **Q: Can you use this in a 2013 escape?** A: You can use it anywhere. It's kept my 1998 Chevy Lumina going over 2 years with almost 178,000 miles on it! **Q: can you mix this with barstop if you all ready put that in the radiator?** A: I did mix this with Irontite All Weather Seal. Did the K-seal first. Irontite a week later. Just to be sure. Since they both said it can remain in the system. Two weeks, still good. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Excellent product. Works really well as advertised. *by M***D on 26 August 2021* Excellent product. Worked wonders with my 2003 Volvo s60 with 261000 kms on the odometer. The engine head gasket had blown up causing water loss. K-seal sealed it in 20 minutes. After applying the fix I drove it for almost 100 kilometers and no water loss at all. Though I have to see how long it lasts. Six months since I used it and the car still runs great without issues. ### ⭐⭐⭐⭐⭐ Superb As described *by R***I on 27 July 2025* I had a leak wasn't detectable, it drove me crazy, no white smoke and no sign of leak, every week i had to top up around 200ml coolant, even at garage wasn't found, and this little magic did stop the leak almsot a month and half no issue till end of July ++ Edit by August beginning Oil mixed with coolant , looks heat exchanger inner issue hop not followed by usage of this item!++ Edit Sep August End coolant pump stopped working, and thermostat and leak from Radiator after heat start to go up, unsure if system clogged, leak was mostly by Radiator damage but not visible because evaporated due engine heat and air flaw! ### ⭐⭐⭐⭐⭐ Leakage killer *by D***S on 17 November 2025* It killed my coolant leakage ## Frequently Bought Together - K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required - PEAK 50/50 Prediluted Antifreeze and Coolant for All Engine Cooling Systems - K-Seal ST3501 Pour and Go Head Gasket Sealer, 16oz, Permanent Repair for Blown Head Gaskets, Cracked Heads and Blocks --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/267704249-st5501-multi-purpose-1-step-permanent-coolant-leak-radiator-leak](https://www.desertcart.us/products/267704249-st5501-multi-purpose-1-step-permanent-coolant-leak-radiator-leak) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-30*