One of my friends used the POR15 stuff to restore the fuel tank on his mid-'60s vintage box Nova a few years back. He hasn't had any problems with it since, but as I recall this restoration process is very sensitive to following the directions to the letter - especially WRT getting the tank clean & completely dry before the sealer gets applied.
Don't know about POR15's ethanol compatibility, but the pump gas around here that he's been running on uses it, however the max. ethanol content is <= 15%. He hasn't run it on E85 or anything with a high ethanol content as far as I know.
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