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Epoxy should be adequate to seal the crack, but make sure it is of a suitable grade for use as a fuel-barrier. Some types of epoxy will gradually dissolve when exposed to ether or liquid fuel. Contact the manufacturer of the epoxy you intend to use if you aren't sure.

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Q: Plastic motorcycle gas tank w a crack in it Will a plastic welding epoxy work?
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Can semigloss enamel paint be used on plastic?

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