| Repair Accessories and Chemicals Gasket Makers If you are shopping for Permatex High-Temp Ultra Copper RTV Silicone Gasket Maker (3 oz.) you have found it.  Permatex High-Temp Ultra Copper RTV Silicone Gasket Maker (3 oz.) For 4-cylinder, turbocharged or high-performance engines. The most advanced, high temperature RTV silicone gasket available. Sensor-safe, low odor, non-corrosive. Superior adhesion. Three times more oil resistant than conventional silicones; eight times more flexible than cut gaskets. Temperature range -75?F to 700?F intermittent; resists auto and shop fluids and vibration. By Permatex.
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