@Rajala, I am very pleased with my compressor and the Grex airbrush with the 0.7mm nozzle. It's not perfect, but it's better than my previous setup. I would love to have the Fuji spray gun system, but I saw it in action last year and it would be overkill for my production. Do I think I might someday want something more? No, I don't. If I ever changed my mind, it would be to get the Fuji (don't look at their website--you'll end up moving to a larger apartment to make room for it). If I were doing velveting, I would probably buy an inexpensive paint sprayer.
Compressors fill with air with the maximum noise (the California Air Tool one I have is not loud at all, especially after you get used to it), then shut off while you continue to use the air until the pressure drops to a preset point, then the motor switches on again and compresses more air. The 2010 compressor motor, with its smaller tank, would have to run more often. I would estimate in my setup the compressor maintains usable PSI for several minutes (not just a few seconds) before the motor kicks in again--but during the whole process there is always a supply of compressed air for the airbrush and I never have to wait for it to get back up to usable PSI.
I have uploaded the diagram (note that it was provided by Grex and so uses their part numbers) to my website:
http://www.jamesdutton.net/chocolates/airbrush_setup_diagram.pdf
