Question before I conduct any testing, but I have a 5 gallon drum of the GREAT old original Texaco rustproof formula (long ago discontinued) & want to reduce it so I can apply with a wand sprayer. It's thick like a tub of grease, so if I reduce it with mineral spirits to spray it, I know it will become flammable as hell. The question is, will the mineral spirits evaporate & just leave the rustproofing after a while? If not, what can I safely reduce it with & not have a fire hazard?