Check the listing for details. Permatex Optimum Grey Gasket Maker. Condition: New. Listed at 10.50 USD. Optimum Grey Gasket Maker by Permatex®. Specially formulated to withstand high vibration and high temperatures up to 700°F. OPTIMUM GREY combines maximum torque load and vibration resistance with extreme temperature resistance: -65°F to 700°F (-54°C to 371°C) intermittent, expanding uses and applications. Designed for high performance and high temperature applications common in import and late model engines and component upgrades. It is sensor safe, low odor, and non-corrosive. Also, an extra noz.zle is included adding convenience, eliminating the hassle of a clogged noz.zle, and allowing multiple uses of each tube without loss of product. The rigid torque and high temperature feature combination joined with outstanding resistance to oils, coolant, and shop fluids make OPTIMUM GREY one of the most versatile gasket makers available.