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I run a 50 gallon Craftsman oil-less air compressor that I originally bought for my air tools for my truck years ago. It has a regulator built in and I added a Badger brand braided airbrush hose with an inline water trap. I plug that into my normal hose. That water trap is critical.

Yes the compressor is VERY noisy when I fill the tank, but I fire it up when I am getting everything set up, it gets up to 100 psi and with that I can airbrush for around an hour or more at 30-40 PSI. For that entire time it is nice a quiet. Usually in that time I need to run into the house to get something anyhow and turn on the compressor to top it off. My current plan is to get a small standalone tank that I can fill from my big one and then take that into the house so I can airbrush with some better heat. :-) Those small tanks are around $30 on amazon.com and can go to 100 PSI and usually include a regulator.

So if you already have a big compressor with a nice tank on it, I say use it. The air is consistent and works quite well, IMO. Either use it directly from the big tank like I am doing at the moment or get a tiny tank and fill from the big one.