K-Seal Ultimate Permanent Head Gasket Repair is a permanent fix for blown head gaskets, cracked heads, and porous engine blocks. Its unique formula works with all water-cooled engines, requiring no draining or flushing of the cooling system and is compatible with all types of antifreeze and coolant. Simply shake the bottle, pour K-Seal Ultimate into your cooling system, and drive. One bottle is sufficient for cars, SUVs, and small trucks, while larger engines may require two bottles. The ceramic micro-fibres in K-Seal Ultimate are designed to seal leaks up to 0.635mm in size, naturally migrating to the leak point to create a durable repair.