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Is 2 part epoxy resistant to gasoline?

Updated: 4/28/2022
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14y ago

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The short answer is "Generally, yes, after it cures completely."

If you are going to use epoxy in a non-critical place where it may occasionally be exposed to fuel for a short time, you are probably safe as long as you make sure that the area is fuel free until after the epoxy cures. If the application is safety-critical or if the exposure is continuous, you should talk to the epoxy manufacturer or vendor before proceeding.

The problem is that there are many types of epoxy resins and hardeners and additives. (Browse around at resins.com.) Not all are resistant to gasoline.

Likewise, there are many different formulations of gasoline with many different additives, and some may attack epoxy more vigorously than others.

Finally, there are a lot of regulations associated with fuel systems and tanks. Depending on what you want to do, this could be important.

Here is a document published by the makers of West System epoxy which addresses tank (including fuel tank) construction using epoxy:

http://www.epoxyworks.com/18/pdf/tanks.pdf.

I personally used fiberglass with West System epoxy to patch a hole in a motorcycle fuel tank. This was a continuous exposure type of application, and it worked fine for several years. After that I sold the bike, but the patch area still seemed solid and it definitely didn't leak.

Good luck.

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