Good question, A34 (although I can't figure out why you'd want to spray Dip It on a model)! Some time back I picked up a couple bottles of Street Wear nail polish called "Toad", an olive drab with gold flecks in it. I though it'd be perfect for Dracula's Dragster, but I haven't had the guts to actually spray it yet.
Anybody got recommendations for thinning this stuff? I was thinking I'd thin the nail polish with lacquer thinner and spray this hot potato over a goodly layer of primer. But I'll be glad to hear from them as has sprayed nail polish successfully (or not - you can learn a lot from mistakes, too).
Have a great weekend, all.