The original Blue. Will not foul oxygen sensors. Replaces almost any cut gasket. Makes reliable "formed-in-place" gaskets that resist cracking, shrinking and migrating. Coats pre-cut gaskets to increase reliability. Temperature range -65° F to 500°F intermittent; resists auto and shop fluids. First generation 1970-1980 gasket maker. Suggested Applications: Valve covers, oil pans, timing covers, water pumps, thermostat housings, transmission pans.