Grey silicone is a high-performance RTV (Room Temperature Vulcanizing) silicone sealant used to create durable, leak-proof gaskets and seals in automotive engines and machinery. It is resistant to high temperatures, oil, water, and vibration, making it ideal for sealing engine components such as valve covers, oil pans, thermostat housings, water pumps, and transmission cases. It cures to form a strong, flexible seal that helps prevent fluid leaks and ensures long-lasting performance.