The other hobby I try to take part in as much as possible is vintage enduro type motorcycles. Bikes from the 60's and 70's frequently had fiberglass tanks to reduce weight to offset the weight of the 3 plus gallons of gasoline that enduro motorcycles typically carried on board. Fast forward to today, and the big problem with running original fuel tanks is the 10% alcohol in today's pump gas. Just this much alcohol can deteriorate the resin that the tanks were originally made up with. There are several products on the market that are designed to "line" the tank and protect it from today's fuel, but they have limited success. And that is just at 10% alcohol !! The only real solution is to run a plastic or metal tank and save the good original tanks for museum pieces, or to make sure you run only alcohol free gasoline in your bike. Even if you were to find sheet material for fiberglass and could assemble one, I think the fuel would get to the material after a short while. And from what I am reading here, using the special epoxy just isn't worth the few grams you might save. The weight can be collectively saved over the rest of the airframe and finish. i know Windy was working with carbon tanks but don't know what his results were or how long they lasted, but if anyone else is familiar with the results, I would be interested to know.
Type at you later,
Dan McEntee