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I used some of the white tank sealer 20 years ago on a couple old stationary engine gas tanks that were so full of holes it was hopeless to try to repair them. They have had gas in them continuously, some sitting for years unused, and they have stayed perfectly leak-free and no gumminess. However, I got some red tank sealer from Napa later and that stuff was junk. Turned to GOO in a couple years.