Can i paint a plastic iPhone with model paint?

I have an old plastic iPhone 3g.
I don't use it as a phone because i can't afford a data plan, but i use it for music and stuff.

Its whole life its never had a case, so the rear plastic cover is shot. Its scratched and worn.

I have a ton of model paint for plastic model car and planes, and i was wondering if it would work on the iPhone rear shell?

Would it stick? Would it scratch and flake too easily? Would it be smoth and glossy? Would it have ugly brush stokes?

Its a black i phone and i want to paint it white. Would that work at all or would it be too hard to cover black with white? Should i sand it first? What can i practice on? A plastic spoon?

Nuptup