K-Seal ST3501 Pour and Go Permanent Head Gasket and Block Repair Just Pour & Go  No Need for Expensive Head Gasket Repairs - The Safe and Easy Way to Fix a Coolant Leak Fixes blown head gaskets, cracked heads and blocks A permanent repair, guaranteed for the lifetime of the engine Scientifically Tested - K-Seal is the only product to have been successfully tested by the equipment at Brighton University and classes as meeting the demands of ASTM D3147 If product did not seal head gasket leak, the system might be Over-pressurized, which causes back pressure and doesn't allow the product to reach the problem area, on this page below under Technical Specification is a PDF Guide with instructions to follow to complete the repair successfully