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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Description

🛠️ Seal like a pro, fly like a boss!

CHEMICAL ARMOR - Formulated to resist gasoline, oil, and grease, protecting your engine components under harsh conditions.
VERSATILE APPLICATION - Ideal for close-fitting machined surfaces, hoses, solid gaskets, and threaded connections—engineered for professionals.
PRESSURE PROOF PERFORMANCE - Endures pressures up to 5000 psi, ensuring a reliable, long-lasting seal in critical aviation and marine environments.
PRECISION SEAL NO HARDENING - Brush-top applicator ensures smooth, flexible sealing without cracking or hardening over time.
EXTREME TEMPERATURE RESILIENCE - Operates flawlessly from freezing -65°F to scorching 400°F, perfect for aviation and automotive demands.

Permatex 80019 Aviation Form-A-Gasket No. 3 is a 4 oz. slow-drying, non-hardening sealant designed for high-performance aviation and automotive use. It resists gasoline, oil, and grease, withstands extreme temperatures from -65°F to 400°F, and endures pressures up to 5000 psi. Perfect for sealing close-fitting machined surfaces, hoses, solid gaskets, and threaded connections, this brush-top sealant delivers flexible, durable protection where precision matters.

Specifications

Material	Plastic
Brand	Permatex
Style	4 oz.
Item Weight	5.6 Ounces
Item dimensions L x W x H	2.44 x 2.44 x 2.75 inches
Water Resistance Level	Water Resistant
Item Form	Liquid
UPC	686226800190
Unit Count	1.0 Count
Global Trade Identification Number	00686226800190
Number of Items	1
Color	White
Surface Recommendation	Close-fitting machined surfaces, Hoses, Solid gaskets, Threaded connections, Fuel fittings
Manufacturer	Permatex
Model	Permatex 80019 Aviation Form-A-Gasket No. 3 Sealant, 4 oz.
Item Weight	5.6 ounces
Product Dimensions	2.44 x 2.44 x 2.75 inches
Item model number	80019
Is Discontinued By Manufacturer	No
Exterior	Polished
Manufacturer Part Number	80019
OEM Part Number	PMT80019
Bulb Type	Fluorescent
Special Features	Flexible setting, For Aviation Engines, For Marine Engines, For close tolerance flanges, Products shall be ideally stored in a cool, dry location in unopened containers at a temperature between 8º to 28ºC (46º to 82ºF) unless otherwise labeled, Slow drying, TYPICAL APPLICATIONS: Solid gasket dressing, Close fitting machined surfaces, Threaded connections, Aviation engines,, Withstands pressures to 5000 psi
National Stock Number	8030-00-220-6973, 8030-01-116-4753

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