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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.
K-Seal Ultimate is the simple, permanent fix for blown head gaskets, cracked heads and blocks, and porous engine blocks. Our unique formula works with all water-cooled engines – there’s no need to drain or flush your cooling system, and it doesn’t matter what kind of antifreeze or coolant you’ve used previously. Simply shake the bottle, pour K-Seal ulimate into your cooling system, and you’re back on the road. Just one bottle of K-Seal ultimate is enough to fix blown head gaskets and cracked heads in cars, SUVs and small trucks. For larger engines, simply use two bottles.