First, if your compressor has a tank make sure you keep the tank drained to eliminate that source of moisture. Also keep your moisture trap emptied. Second, if you have a long hose between your compressor and airbrush I'd look at moving the moisture trap or adding a second one. I have my compressor on the far side of my basement from my bench and a 50' hose crossing the basement. I have a trap/regulator on the compressor and a second trap/regulator at my bench. If you don't have a long hose between the compressor and airbrush you might consider adding an inline trap near the end of the hose, something like the trap near the bottom of this page: http://www.badgerairbrush.com/access2.htm To install that you will, of course, have to cut your hose.