K-Seal ULTIMATE K3501 Head Gasket Repair 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  theres no need to drain or flush your cooling system, and it doesnt matter what kind of antifreeze or coolant youve used previously. Simply shake the bottle, pour K-Seal ULTIMATE into your cooling system, and youre back on the road.  Just one 16oz bottle of K-Seal ULTIMATE is enough to fix blown head gaskets and cracked heads in cars, SUVs and small trucks. For larger vehicles, simply use two bottles.