Permatex Ultra Red Gasket Maker 3.35 Oz. is a high-performance low-odor formulation, outperforming the previous gen. Red RTV, Ultra Red resists temperatures up to 640 F (343 C). This high temperature gasket maker is resistant to high thermal cycling and is sensor safe, non-corrosive RTV. This chemical gasket maker 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.