there was stuff the paint shop sold you would dump it in ppg bob cat thinner it was green and was for dust before you painted i used if all the time 20 years ago but do not remember . old timers . here are some tips alot of junk comes out of the gun make sure it clean clean clean . off the cup of the gun and the hose i all ways used a old tack rag and went over the air hose and you . and ways grounded the car not sure if that worked but did it anyways