Permatex Form-A-Gasket Sealant No.1 1C 311g is a premium slow-drying, non-hardening gasket sealant designed for automotive, industrial, and aviation applications. It creates reliable, leak-proof seals on close-fitting machined surfaces, hoses, and solid gaskets while resisting gasoline, oil, and grease. The sealant performs across a wide temperature range from -54°C to