Permatex® Ultra Red® Silicone Gasket Maker 3 oz. This high temperature gasket maker is resistant to high thermal cycling and is sensor-safe, non-corrosive RTV. Can be used in replacement of pre-cut gaskets and is ideal for high-temperature applications such as the exhaust manifold, header, turbochargers and slip-fit exhaust parts. Low-odor formulation. Resists temperatures up to 650 degrees Fahrenheit.