I've used that red epoxy that is cured with heat with success on my fuel tank. It's been over 2 years now and no leaks at all. I would use that to mate the petcock to the tank, especially if the tank is not flat, a gasket will not seat it properly. I think JB weld hold for a while but not too long.
I used a heat gun to cure the red epoxy. No flame of course.....
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