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The less pressure you use, the flatter the paint and the less waste. I try to stay below 20 psi.
I have had about 5 air brushes in my life. The first was a cheap HF air brush. It was junk, the next was a cheaper Badger. Those two air brushes leaked, and clogged and wouldn't spray at anything less than 25 psi. I finally broke down and spent 99 bucks on the primo Badger and was mildly satisfied.
Then I went to the accucraft site and they had an air brush listed at 49 bucks, I thought it was a cheapy, but thought I'd give it a shot. I bought another one after that, because it is by far the best air brush I have ever used.
It is slim,
well balanced,
lays down a nice coat of paint at 10 psi,
has easy access to the needle adjustment (you don't have to take off the back housing,
the needle tip is protected by a cowl,
the bottle can be completely dis-assembled and cleaned,
the hose is a good 2 ft longer than the other brushes,
and it comes with a quick slip coupler so you can disconnect the brush from the hose without turning off the air.

One thing you might like to try is make sure that you are using the proper proportion of thinner to paint. That can have a huge affect on how well the paint lays down. Also make sure your compressor is clean.
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