I just completed a two gallon fuel carrier using birch plywood. Finished it with water based Varathane Diamond clear gloss floor finish (it's a water based polyurethane). I used 5 coats, sanded between each. Water based ployu is very light weight.

So far (a month) of exposure to 10% and 15% nitro have not shown any problems. I also use this stuff to fuel proff engine and tank areas and for glassing.

A downside might be its cost. Currently running about $38.00/gallon at Lowe's.

Works for me...

Dan