the small compressor can work but bigger is better . they can make alot of water and paint will not mix and if you over work the small pump you will push oil and the air line can we say FISH EYES you need many water traps not just one on the gun .the ones like denny has and one on the gun is what i use many years i all ways run 3 traps. i allways put a new throw away trap on the gun every time i shot the finsh paint was much cheaper then a repaint with the price of paint now days