RE: fuel proofing?
Most spray paint, particularly enamels dissolve in Nitrofuel, hence the problem.
These types of discussions really belong on the other forums btw.
The Epoxy and Alchohol works, but you must NOT use rubbing alchohol. There is far too much water in it.
Instead use denatured alchohol that you would find in the solvents and paint section of the hardware store.