Permatex’s Ultra Red offers high temperature resistant available today. Ultra Red is a high-performance low-odor formulation, outperforming the previous gen. Red RTV. Ultra Red resists temperatures up to 650°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.