Form-A-Gasket™ No. 1 Sealant (80003) by Permatex®, 11 oz. Tube. Fast-drying, hard-setting sealant designed for sealing rigid materials and flanges, or patching holes and joints where permanent assembly is desired. Temperature range -65 °F to 400 °F (-54 °C to 204 °C); resists common shop fl uids and fuels.