I will be the first to add some truly useless information! I use a 4 HP, 80 gallon compressor. The same one I use for everything else in my shop. The point is, if you have other uses for a larger compressor, you can do hobby stuff with it as well. I use a 20 year old Badger 200, because I needed an airbrush to touch up some cabinets, and that is what I could get immediately. So I am the perfect example of what Harry described: I use what I use because that is what I have, and don't know anything about anything else!