The Solv-Tec K-Seal coolant leak repair makes permanent repairs to cooling systems on all types of vehicles. The super-concentrated formula not only permanently repairs blown head gaskets, but it also seals leaks in the radiator, heater core, head, block, water pump and core plug. K-Seal mixes with all antifreeze/coolant so there is no need to drain or flush the system before or after treatment. One bottle is enough for engines up to 12 cylinders. K-Seal conforms to ASTM D-3147 standards for stop-leak additives for engine coolants. For heavy duty engines, technicians can use K-Seal HD.