Permatex Ultra Red high temperature resistant, high-performance low-order formulation, outperforming the previous gen, Red RTV, resists temperatures up to 650 F, resistant to high thermal cycling, sensor-safe, non-corrosive RTV, this chemical gasket maker can be used in of pre-cut gaskets and is i for high-termperature applications such as the exhaust manifold, header, turbochargers and slip-fit exhaust parts.