Sodium Silicate pint Liquid "N" Brand Sodium Silicate liquid is used as a major deflocculant in preparing ceramic casting slip. This is a pure sodium silicate and must be mixed with water to a 50/50 solution for most casting bodies Automotive repair - One of the popular uses of Sodium silicate solution is seal leaks at the head gasket. This offer is for one 16 Ounce Pint Jar.