Permatex® Super “300” Form-A-Gasket® Sealant

Permatex® Super “300” Form-A-Gasket® Sealant

Non-hardening sealant designed to resist heat transfer fluids such as oil or antifreeze. Temperature range -65°F to 400°F (-54°C to 204°C); resists antifreeze, aviation fuels, aggressive detergent bearing oils and lubricants.



• For use on all types of gaskets

• Non-hardening

• Seals threads and hoses

• Excellent oil resistance

• Applies easily


For assembly as form-in-place gasket 

1. Remove all previous material from mating surfaces. Permatex Gasket Remover is recommended for most materials, not for plastics or painted surfaces.

2. For best results, clean and dry all surfaces with a residue-free solvent, such as Permatex Brake and Parts Cleaner.

3. Apply a thin, continuous and even bead of product to both surfaces to be sealed. First tracing the internal areas of the gasket configuration, then all surrounding bolt holes as shown below:

4. Allow to air dry for 5 to 10 minutes.

5. Assemble parts immediately while the product is still wet. Secure or tighten to recommended torque specs. Allow 1 hour at room temperature before use. Note: Slight warming decreases drying time

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