The Permatex Ultra Copper Maximum Temperature RTV Silicone Gasket Maker is the perfect solution for sealing and protecting your engine components. This tube of silicone-based formula is non-corrosive to metal and other materials, preserving the integrity of the sealed surfaces. It is also resistant to automotive fluids such as oil, coolant and transmission fluids, making it ideal for use in a variety of automotive applications. FleetPride is your First Click in Heavy Duty®.