How long will the product remain good after opening the bottle?

this is the second time I've bought a bottle of this product. The first one I bought from a local auto parts. When the first one ran out it was over 20 years old and still good. It will last a long time as long as you seal the lid well and don't leave it open for long periods. I use it then put the lid right back on

Is this compatible with plastic fittings? I have a diesel storage tank with 3/4" threads that leak a little and I am looking for a sealant.

I primarily use this on Triumph motorcycle cases and it is the best Permatex (or any) product for the job. I've also used it on rubber pipes to metal banjos and it worked well there too. I suspect that it would work well in your situation but I have not used it on plastic and there are so many kinds of plastic that I would test it first. Personally, on threads where gas or oil is involved, I use the yellow Teflon tape -- it seals gasoline so diesel should be no problem.

My red plastic Moeller marine portable 6 gallon fuel tank has some small gas leaks around the screw on caps - think it would be safe to use...?

It would probably be safe to use but when mine was apparently shipped in a non-pressurized airplane hold. The cap was intact but the sealer had leaked out all over. I will buy locally next time. Auto stores may have it or may be able to get it.

would this work for marine freshwater outboard motor such as water pump gasket sealer

I don't see why it won't..I used it on my oil pump ad my water pump...works great...no leaks..oil, antifreeze does not have any affect on it..Good stuff.

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Permatex 80019 Aviation Foam A-Gasket No.3 Sealant, 4 oz

Product ID: 729553427

Details

Brand
Permatex
Item Weight
5.6 Ounces
Item dimensions L x W x H
6.2 x 6.2 x 7
Material
Plastic
Style
4 oz

⏳Slow drying for precision

🔥Withstands -140°F to 400°F

🛠️Resistant to gasoline, oil & grease

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COP 521598

Duties & taxes included

In stock

Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Seal like a pro, fly like a boss!

FUEL GREASE PROOF - Engineered to resist gasoline, oil, and grease for long-lasting reliability.
AVIATION GRADE CONFIDENCE - Approved for aviation and automotive use—trusted where failure is not an option.
EXTREME TEMPERATURE WARRIOR - Operates flawlessly from freezing -140°F to scorching 400°F environments.
PRECISION SEAL ZERO HASSLE - Slow drying formula lets you perfect the seal without rush or mess.
VERSATILE FIT FOR EVERY JOB - Ideal for machined surfaces, hoses, and solid gaskets—your go-to sealant for all tight tolerances.

Permatex 80019 Aviation Foam A-Gasket No. 3 Sealant is a 4 oz slow-drying, non-hardening brush-top sealant designed for aviation and automotive applications. It resists gasoline, oil, and grease, and performs reliably across a wide temperature range from -140°F to 400°F. Perfect for sealing machined surfaces, hoses, and solid gaskets, it withstands pressures up to 5000 psi, making it the trusted choice for professionals demanding durable, flexible, and precise sealing solutions.

Specifications

ASIN	B000HBM3QQ
Brand Name	Permatex
Color	white
Compatible Material	Metal
Customer Reviews	4.7 4.7 out of 5 stars (2,077)
Global Trade Identification Number	00686226800190
Included Components	Permatex 80019 Aviation Form-A-GasketNo. 3 Sealant, 4 oz
Item Dimensions	6.2 x 6.2 x 7 cm
Item Form	Liquid
Item Type Name	Permatex 80019 Aviation Form-A-GasketNo. 3 Sealant, 4 oz
Item Weight	5.6 Ounces
Manufacturer	Permatex
Material Type	Plastic
Model	80019
Number of Items	1
Part Number	80019
Style Name	4 oz
Surface Recommendation	Exact fit machined surface, hose, solid gasket, screw connection, fuel fittings
UPC	686226800190
Unit Count	1.0 Count
Water Resistance Level	Water Resistant

Reviews

S**N

Superfast delivery to Riffic item would highly recommend

17.01.2025

J**H

This is good stuff

26.02.2026

J**N

I used this for install frost plugs on engines. So far it seems fine.

16.01.2026

S**E

Gasket cement

20.05.2021

A**R

This stuff is great for gasket application's. Easy to apply, clean up with alcohol

2.04.2026

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