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Re: A sealant that is impervious to gas?
Just an option that I have not tried.... But when working on aircraft integral fuel tanks we use a sealant called B-2, also comes in a variants including B-1/2(B-half). Its a two part sealant and can be purchased on the internet. It mixes in a tube (takes about 50 strokes to fully mix it) and mixes the entire tube at one time. You typically have a about 20-30 minutes to work it and can set up can be 2 hours to 12 hours@70'F depending what kind you buy. Once mixed it doesn't matter, use a little or lot but the whole thing will harden up. Its stays pretty pliable even when cold, little shrinkage but its expensive. Probably about 40 bucks for a small tube the size of a large tube of toothpaste. I've never fixed a gas tank or filler neck with it but it works great in a kerosene/aviation fuel environment.
88Ironduke
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