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 .25 Pint Aviation Form-A-Gasket No. 3 Sealant

Product ID: 651392553

Details

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

⏳Slow-drying for precision

🔥Wide temp range -65°F to 400°F

🛢️Resists gasoline, oil & grease

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294 zł

Duties & taxes included

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Description

🛠️ Seal like a pro, perform like a pilot!

CHEMICAL ARMOR - Unmatched resistance to gasoline, oil, and grease keeps seals intact under pressure.
VERSATILE APPLICATION - Ideal for close-fitting machined surfaces, hoses, solid gaskets, and threaded connections.
AVIATION GRADE RELIABILITY - Approved for aviation and automotive use—trusted by pros who demand the best.
PRECISION SEAL NO HARDENING - Brush-top formula stays flexible for perfect gasket fit every time.
EXTREME TEMPERATURE RESILIENCE - Operates flawlessly from freezing -65°F to scorching 400°F environments.

Permatex Aviation Form-A-Gasket No. 3 is a slow-drying, non-hardening sealant designed for aviation and automotive use. It resists gasoline, oil, and grease, and withstands temperatures from -65°F to 400°F. Perfect for sealing close-fitting machined surfaces, hoses, and solid gaskets, this brush-top formula ensures durable, flexible seals trusted by professionals.

Specifications

ASIN	B000HBM3QQ
Best Sellers Rank	#267,360 in Car & Motorbike ( See Top 100 in Car & Motorbike ) #219 in Fillers, Adhesives & Sealants
Brand	Permatex
Brand Name	Permatex
Colour	White
Compatible Material	Metal
Customer Reviews	4.7 out of 5 stars 2,077 Reviews
Global Trade Identification Number	00686226800190
Item Dimensions	6.2 x 6.2 x 7 Centimeters
Item Form	Liquid
Item Weight	5.6 Ounces
Item dimensions L x W x H	6.2 x 6.2 x 7 Centimeters
Manufacturer	Permatex
Manufacturer Part Number	80019
Material	Plastic
Material Type	Plastic
Model	80019
Number of Items	1
Style	Compact
Style Name	Compact
Surface Recommendation	Close-fitting machined surfaces, Hoses, Solid gaskets, Threaded connections, Fuel fittings
UPC	686226800190
Unit Count	1.0 Count
Water Resistance Level	Water Resistant

Reviews

S**N

Excellent item

17.01.2025

J**H

Works great

26.02.2026

J**N

Does the job.

16.01.2026

S**E

Works well

20.05.2021

A**R

Old school

2.04.2026

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294 zł

Duties & taxes included

In stock

Sold byAmazon PolandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Poland.

Secure transaction

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