I run a large water trap just off the pressure regulator , then as long a hose as available , for me 6' to 8' , then an inline water trap just before the connection to the air brush . Always paint with the compressor not running to get the air the coolest with less moisture in it , I let mine run just after spraying while I do whatever is next , another coat , change colors or rearrange parts to be painted , then let it sit before I spray again .