Use the spray bottle that you use to clean the paint gun, and a piece of 1,000-grit abrasive paper. Mist the run with water, then work over it with the sandpaper in a circular motion.

Part of my process involves spray painting different layers, ... has anyone here made their own UV curing box? As I said, this is sheet goods, 1/4" max thickness, max WxH is 12"x24".