Fibreglass tank liner damaged by ethanol in petrol

2 years ago I sealed the fibreglass tank on my '71 Roadster using Wylde's Flowliner. No problem till this month when all the white lining started to bubble up and peel off. ? due to ethanol in the latest petrol. What is the best/safest solvent to get the rest of the lining out and what is the best stuff to reline a fibreglass tank with? Thanks.
SteveM

Perhaps cutting the bottom out, scraping the entire inner surface, sealing with a modern "hard" liner, then re-sealing the bottom completely.

These are times that try men's souls (when it comes to 'glass tanks & modern fuels)

I'd guess Alcohol would going by your own reports. Also acetone, might too, which also dissolves fiberglass resin too. Might grab a sample of the stuff and see or contact supplier to get more direct answer. I pre flush with acetone and then hair drier in sun for hours before applying Castwells 2 part epoxy witch might just coat over and seal down the bad stuff. Could make a whole tank out of it as its going on thick and bonds to itself as well as tank.
http://www.caswellplating.com/aids/epoxygas.htm

Are the original tanks made from polyester resin and chopped mat? If so that would explain the weight and lack of resistance to modern fuels. An epoxy resin - woven glass/carbon/Kevlar tank would be a much better option.

Last month I had a similar problem with the fiberglass tank on my '68 fastback, I had sealed it years ago, before the ethanol gas, and now it was dissolving the sealer. I recently stripped out the old sealer with solvent, and re-sealed it. It was a fair amount of work to remove the old sealer. I had talked with Bill Hirsch Auto, who had made the old sealer, as well as the new sealer I used, and MEK (Methyl Ethyl Ketone) is what they recommended to remove the old. It is nasty stuff, but it works. The MEK along with nuts/bolts/screws or such to break it up, worked, although there was quite a bit a shaking the tank back and forth to remove it. I did several flushes of it, and all and all it took the better part of a day. Now the MEK (and other solvents) can dissolve the fiberglass itself if you let it sit too long, but I had no issues with that using it over the course of a day. BTW, I found that for me, large lag screws, with their sharp threads worked the best. Use a good quality respirator with the stuff though.

-Matt

Best bet would be to us METHANOL . Sh'd go a lot better .