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As mentioned, a moisture trap captures water in the air line. If water gets into your air line, you get it sprayed onto the model you are trying to paint. In the past I've had some water on my models when using lacquer based paint - it messes things up! Since then I've gotten a moisture trap and haven't had any problems. Don't know what the water would do on acrylic paints, but probably nothing good. The moisture trap is an in line filter. You normally have to cut your air hose to insert it. Mine is made by Paasche, but there are many others. Cheap insurance! As to air pressures, a lot depends upon your spraying outfit. When acrylics first came out it was recommended that at least 30 PSI be used, as they were not intended to be thinned before use. I found that I more or less had to test paint for spraying, as the consistancy of the paint was not always the same. Some would spray OK at lower pressures, others needed much more just to get out of the airbrush. Experiment and you will find what you need. Bob Boudreau
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