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Product Details

Permatex Aviation Form-A-Gasket No. 3 Sealant is a slow-drying, non-hardening brush-applied liquid gasket/dressing/coating. Aviation Form A Gasket is a thin, brush-able dressing or sealer suitable for -65 to 400 F temperatures. Resists antifreeze, gasoline, oils, and lubricants. 4 oz. bottle. Also great for sealing tapered and straight threads on fuel fittings that require gasoline resistance.

Tech Specs
Chemical / Solvent Resistance The product retains effective properties in contact with water, ethylene glycol, gasoline, motor oil, transmission fluid and sea water
Product Benefits For close tolerance flanges, Slow drying, Flexible setting, Withstands pressures to 5000 psi
Info & Guides

Suggested Applications:
Close-fitting machined surfaces, sealing hoses, solid gaskets, Threaded connections, Fuel fittings, marine engines, aviation engines

Reviews for Permatex Aviation Form-A-Gasket No. 3 Sealant

4 of 4 Reviews

May 29, 2019

I would by this product again.
By Shenanigans from Long Island, New York

Verified Purchase

Sealer worked great, work as advertised.

Bottom Line Yes, I would recommend to a friend

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August 13, 2018

Good Stuff
By Rhody Runner from Warren RI

Verified Purchase

Did a head replacement. Used this on bolts and most gaskets (not head gasket). Seemed to work well.

Bottom Line Yes, I would recommend to a friend

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July 17, 2016

Bad packaging by Jamestown
By Bryce from N. Illinois

Jamestown should put items like this in a separate plastic bag AND tape around the cap of the bottle.


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April 16, 2014

Be Careful
By Tim from West Alton, MO

Verified Purchase

While the product is very good the packaging was not. This is some very sticky stuff and despite the extra little flap of tape that JD put over the cap it still leaked all over the rest of the contents of my package. Either order this product alone or only with other products that can be wiped off with paint thinner or solvent.


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