Product: K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair
Brand: K-Seal
Permanent coolant leak repair - Just shake, pour and go
Mixes with all antifreeze
No draining or flushing
Fixes cracks and leaks in radiator, head gasket, freeze plugs, cylinder heads, heater core, water pump casing and engine blocks
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

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