C K Fast Gasket Black is a silicone rubber bonding and sealing compound contained in a convenient pressurized package with an easy-dispensing nozzle. You can make any size or shape gasket to replace a wide range of cork, paper, asbestos, felt and metal gaskets. 100% silicone. Use on oil pans, oil pumps, water pumps, thermostat housings, timing case covers, valve covers, push rod covers, transmission pans, and cam shaft rear covers. Stable for hot engine oil and Glycol anti-freeze. Low volatility. Temperatures range up to 500ºF. Oxygen Sensor Safe.