K-Seal ULTIMATE is the simple, permanent fix for blown head gaskets, cracked heads and blocks, and porous engine blocks. Guaranteed repair for the life of your engine, or your money back!
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 ULTIMATE 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.
K-Seal ULTIMATE will naturally separate if left to sit for an extended period. It’s important to shake the bottle for 30 seconds before application, to ensure an effective treatment.
Pour K-Seal ULTIMATE into your radiator (but not directly onto the radiator core) or header / expansion tank. K-Seal ULTIMATE will not be affected by any coolant, antifreeze or other additives already in the cooling system. It can be used in hot or cold engines.
Once you have applied K-Seal ULTIMATE to your coolant system, simply run your engine as normal.