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I have found that I like to fill the tank up to about 75 psi and start spraying at about 40 psi. I'm sure any pressure you'd like to fill the tank to will work, but the more you fill it and the lower the pressure you spray at, the longer it will last. It will spray at 40 psi for several minutes (about the time it takes me to spray a coat over a locomotive shell). It maintains the pressure you set until the tank itself begins to fall below your set pressure. At that point I just turn it back on (the on/off switch is wonderful) and let it fill back up. I've found that being able to regulate the output pressure of a compressor is another useful and effective control to augment the air and paint volume controls on your airbrush. I haven't had satisfactory results below 25 psi and I can't really control the paint above 50 psi. But within that range, I can really tweak my control of the brush. I haven't had any bursts of water come out of the brush yet, but I usually limit my painting sessions to just a few minutes in length. That used to happen pretty frequently with the Paasche compressor. It was drastically limited with a vapor trap though. I haven't had a need for a vapor trap with this compressor, but if you wanted to buy one, they have one in the same spot at Wal-Mart as the compressor itself. It should work fine. I live in Colorado, so I'm used to working in pretty dry conditions (compared to Georgia or Texas where the humidity is unbearable). I should mention that the main reason I'm so quick with my painting is that I live in an apartment and I'm paranoid about noise. However, it's probably just paranoia because this compressor is about a tenth the noise level of the Paasche. I don't know if I mentioned it in the previous post, but I think I paid around $150 for the Paasche compressor and my new Campbell Hausfeld cost under $100. If that doesn't say it all, nothing will. Happy Painting! RC
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