Any company that makes cardboard boxes uses sodium silicate to seal their boxes. Sodium silicate is a glue; however, I would check with an automotive supplier of parts. They should have the properly sealer for a head gasket. The best and only way to cure a blown head gasket is to replace it with a new one. by cobbling it up with sodium silicate you are just prolonging the problem and maybe causing more damage. antifreeze will destroy your engines bearings if it gets into your oil which in turn ruins the crank. you should also get the head magna fluxed for cracks and checked for straightness. be sure to check the blocks deck to make sure its clean & straight as well.
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