I used Red Kote to seal a leaking gas tank. Now, it won't help if the area is loose or moves, but if the joint is mechanically sound, with only a crack that is seeping, it might be a solution. My tank was weeping through the seams, and the red kote sealed them. I bought a quart of the tank sealer at O'Reilly's auto parts, I think it was about $27. Looks like it will seal many tanks, I'll probably never use it all.
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