Regular, over the shelf, alcohol. The kind you may be able to purchase at your local market. If not there, then at your local drug store/apothocary.

Another method for fuel proffing is to use any form of resin. It can be of a laminating or marine type.

Also useful is any type of polyurethane paint.

Epoxy thinned with alcohol is still the cheapest, and probably the easiest method.

Silversurfer