Vital Black RTV is the original gasket maker formulated for heavy duty applications. It makes reliable “formed in place” gaskets which resist cracking, shrinking and migration caused by thermal cycling. It is ideal to replace almost any cut gasket. Also use to coat pre cut gaskets to increase reliability. It is permanently flexible and stable at temperature of between -80ºF to +600ºF (-62ºF to +315ºC) intermittent. It is also highly resistant to auto and shop fluids.