I know internal gas tank sealers exist and there's always brazing / lead to fill pin holes. But I was curious... would stripping a motorcycle gas tank to metal, externally, then laying down a few coats of epoxy primer sealer fill pinhole leaks from the outside? Or, technique number B, could you use tank sealer (Caswell / Red Kote) on the outside of the tank then paint over it? ...just curious really. It seems it would be much easier to remedy sealer issues on the outside of the tank instead of having to get that crap off internally.