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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80019 Aviation Form-A-Gasket (No.3 Sealant,4oz) | Creates a flexible, leak-resistant seal for engines, pumps, and flanges

Product ID: 258211081

Details

Brand
Permatex
Item dimensions L x W x H
6.2 x 6.2 x 7
Item weight
4 Ounces
Material
Resin
Style
4 oz.

⏳Slow-drying formula for precision

🔥Wide temp range -65°F to 400°F

🛢️Resists gasoline, oil & grease

R782

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Description

🛠️ Seal like a pro, perform like a pilot!

CHEMICAL ARMOR - Unmatched resistance to gasoline, oil, and grease protects your critical joints
AVIATION GRADE RELIABILITY - Approved for aviation and automotive use—trusted by pros who demand perfection
PRECISION SEAL NO HARDENING - Brush-top applicator ensures smooth, non-cracking seals every time
EXTREME TEMPERATURE RESILIENCE - Performs flawlessly from freezing cold to scorching heat (-65°F to 400°F)
VERSATILE SURFACE COMPATIBILITY - Ideal for close-fitting machined surfaces, hoses, solid gaskets, and threaded connections

Permatex 80019 Aviation Form-A-Gasket No. 3 Sealant is a slow-drying, non-hardening resin-based sealant designed for high-performance aviation and automotive applications. It resists gasoline, oil, and grease while withstanding extreme temperatures from -65°F to 400°F. Its brush-top design enables precise application on close-fitting machined surfaces, hoses, solid gaskets, and threaded connections, making it a trusted choice for professionals seeking durable, chemical-resistant seals.

Specifications

ASIN	B000HBM3QQ
Best Sellers Rank	#22,410 in Automotive ( See Top 100 in Automotive ) #106 in Automotive Fillers, Adhesives & Sealants
Brand Name	Permatex
Color	White
Compatible Material	Metal
Customer Reviews	4.7 4.7 out of 5 stars (2,150)
Global Trade Identification Number	00686226800190
Included Components	Permatex 80019 Aviation Form-A-Gasket No. 3 Sealant, 4 oz.
Item Dimensions	6.2 x 6.2 x 7 centimeters
Item Form	Liquid
Item Type Name	Permatex 80019 Aviation Form-A-Gasket No. 3 Sealant, 4 oz.
Item Weight	4 Ounces
Manufacturer	Permatex
Material Type	Resin
Model	80019
Number of Items	1
Number of Packs	1
Part Number	80019
Style Name	4 oz.
Surface Recommendation	Close-fitting machined surfaces, Hoses, Solid gaskets, Threaded connections, Fuel fittings
UPC	686226800190
Unit Count	1 Count
Water Resistance Level	Water Resistant

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R782

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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