My experiences with Duracoat.
I have Duracoated 2 rifles and misc parts, my buddy sprayed one I did the other. I had bad luck with the cheap airbrush, air can sold in a kit. It wouldn't feed paint, when it would it was blobs. tried everything to remedy it and ended up ordering a paasche single action brush with a compressor.
Spraying.
The Duracoat finish sprays great with the compressor set to 30 psi and a medium needle. Use a small spray pattern to finish small parts and open it up for the larger parts. Heed the directions when it states to let the finish cure for 3 to 4 weeks for use(you can bake it to speed up the process). I built one of the rifles 24 hrs after spraying and the finish was real fragile, coming off during assembly in some spots. The other rifle cured the full time and the finish is much more durable. Regular lacquer thinner cleans up the equipment nice and is a lot cheaper than the Lauer reducer.
I havn't tried Norrells yet but I have a bottle of glossy black and am going to spray a pistol using Stickmans excellent tutorial.