VHT SP21A Copper Gasket Cement is specially formulated with the same ingredients as the world renowned high temperature coating.VHT copper gasket cement maintains excellent adhesion under severe pressure and heat fluctuations. The high metallic formula assures tight seals on cork, paper and metal gaskets. VHT copper gasket cement has been extensively tested on racing engines in the field and on the dynamometer. It has met or exceeded the high compression and high temperature requirements of these mega horsepower engines. Use per instructions printed on the can.