Paint Gun Help

Jim, it depends on the paint you used in the past,and what you cleaned it with. If you have a gun that has a rubber gasket inside when you take the nozzle off and have sprayed lacquer or cleaned it with lacquer thinner ,then the little black o ring gasket may be corroded or eat up, if you haven't ,then take it apart and clean all the little holes in the head (i use a single strand out of a small wire cable). Also take the back screw off and watch how the spring comes out and pull the entire inside of the gun that goes thru the trigger all the way to the front tip, i had sprayed clear with mine and used fast hardner, thought i cleaned it fast enough ,but the clear had hardened spraying my truck, then about a month later, tried to spray base coat on car and it came out in big drops. Forgot to, if you take the cup off, there is a screen and o ring there also