Not to bash the Deft method, but I tried using it on a sample and I could easily peel up the glass that I put it down with, not exactly something that I liked.

I just finished glassing a large warbird with Z-poxy and I am pretty impressed with the results. After it cures out, it dry/wet sands easily and doesn't clog the paper up. I mix it 1 part resin,1 part hardener, 1 part alcohol, this helps it flow out and keeps from putting on too much.

Before priming I wiped the whole plane down with lacquer thinner and just started spraying. Use a high quality primer for automotive applications (no rattle can) and you won't have a problem with the paint not sticking down the road. I'm planning on a Klass Kote finish for this one.