I am chuffed about this, so please excuse my enthusiasm. For YEARS I have been frustrated by water in my airline that came out as drops through the air brush with the resulting mess on the surface being painted. I can't afford to use nitrogen or other gases that don't hold water, so I went the water trap route. I have two, one in line and one of the cup variety, but even in an air conditioned environment, I still got water. No one I asked had a clue as to what to do. But, with the intervention of the internet, I think I may have solved the problem. Now beware, there's some science content here, so you may want to skip to the end if you're brain is in weekend mode.
Apparently, water traps are good at trapping water, but not water vapor. The compression of the air heats it and hot air holds much more water vapor than cool air. If your water traps are so close to the compressor that the air has not cooled sufficiently for the water vapor to turn to water, the vapor passes through the trap and condenses further down the line as a droplet that later shoots out your airbrush. The internet had a simple solution. Put about 50 feet of air hose between your compressor and your water trap. The extra air hose serves as a radiator and the air cools and the water condenses out before the water trap and is there-by caught in that trap. The air in the line after the trap is cooler and is moister free, or at lease water drop free. I've tried it and it works.
Now 50 feet of air hose may sound like a lot and maybe the internet was talking about bigger uses than my little set up, but the air hose seemed to come in 50 foot lengths and it only cost $12. Be careful of end fittings. You may need male and/or female and the hose may come with the opposite. You can buy them where you get the hose.
Maybe I'm slow and you all know this already, but for those of you like me who have had to endure spritzing airbrushes, here's a possible solution.