Some auto parts stores have "play-dough" epoxy sticks that are rated
for patching holes in gas tanks. J-B makes one, in fact. They might
be physically easier to work with than classic goop-format J-B in your
situation. A coat of the latter over the cured play-dough would be a
belt and suspenders approach.
There are several brands of this play-dough epoxy oriented toward
various purposes, and I keep an appropriate selection in both home and
car. Amazing what can be fixed with it, or at least "MacGyvered" well
enough to get you to the main road, a three-day weekend, next month's
paycheck, or whatever a proper repair involves.
Cheers,
--Joe
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