RE: I have made my descision
You can fuel-proof the interior of the fuesalage by applying a light coating of:
A) fuel-proof paint
B) epoxy thinned with denatured alcohol (50/50 mix)
C) Midwest Aero Gloss thinned with dope thinner (50/50 mix)
You will want to pay particular attention of the interior woodwork immediately surrounding fuel tank.