Permatex Aviation Form-A-Gasket No. 3 Sealant is a slow-drying, non-hardening, brush-top sealant approved for both aviation and automotive use. Resistant to gasoline, oil, and grease, it functions within a temperature range of -65°F to 400°F. It's ideal for close-fitting machined surfaces, sealing hoses, and solid gaskets. When a chemical gasket isn't appropriate, Permatex offers a wide selection of gasket sealants suitable for import and domestic vehicles of all model years and performance levels.