Permatex Ultra Black RTV Silicone Gasket Maker is a sensor-safe, low odor, noncorrosive gasket material that retains high flexibility and oil resistant properties through the use of a patented adhesion system. Designed for superior adhesion to oily surfaces and long term durability. Superior resistance to powertrain fluids including engine oil, transmission fluid, gear lube, and coolants. Retains high flexibility and eliminates the need for pre-formed, pre-cut gaskets.