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, perform like a pilot!

VERSATILE APPLICATION - Perfectly seals machined surfaces, hoses, and solid gaskets across aviation, marine, and automotive uses.
CHEMICAL PRESSURE TOUGH - Resistant to gasoline, oil, grease, and withstands pressures up to 5000 psi for ultimate durability.
PRECISION SLOW DRY FORMULA - Ensures perfect sealing without hardening, giving you flexibility and reliability on every job.
EXTREME TEMPERATURE RESILIENCE - Operates flawlessly from -65°F to 400°F, ideal for demanding aviation and automotive environments.
TRUSTED AVIATION GRADE QUALITY - Approved for aviation engines and proximity tolerance flanges, ensuring professional-grade performance.

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 use. It resists gasoline, oil, and grease, operates in extreme temperatures from -65°F to 400°F, and withstands pressures up to 5000 psi. Ideal for sealing machined surfaces, hoses, and solid gaskets, it delivers professional-grade reliability trusted in high-performance environments.

Specifications

Manufacturer	Permatex
Part number	80019
Item Weight	158 g
Product Dimensions	6.2 x 6.2 x 6.99 cm; 158.76 g
Is Discontinued By Manufacturer	No
Size	Pack of 1
Color	white
Style	4 oz
Material	Plastic
light-source-type	Fluorescent
Special Features	Flexible Settings, For aviation engines, For marine engines, For proximity tolerance flanges, The product should be stored in an unopened container temperature between 8º and 28ºC (46º to 82ºF), Tumble dry slowly, Typical applications: solid gasket dressing, perfect fit for machined surfaces, screw connections, aviation engines,, Withstands pressure up to 5000 psi
Included Components	Permatex 80019 Aviation Form-A-GasketNo. Sealant, 3-Pack, 4-oz
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	6.2 x 6.2 x 7 cm

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