I saw a new paint system on Speed about a month ago. They used it on a rat-rod looking truck. It seemed like a pretty nice system. It had primer, paint, and a clear coat in a matte finish. You didn't need the additives or hardener for the paint. I don't know if it still gives the hardness for the clear compared to a normal clearcoat, but it'd be worth a shot. All you'd need is a spray gun, and you could get a fair one relatively cheap. I'd stay away from the spray bombs if you can. They never seem to get a nice finish, and you have to put on really light coats to stop runs. Too much of a pain in the ***, in my opinion.