Nozzles on paint sprayers are difficult to get thoroughly clean. Many times, dried residue can clog the nozzle and send paint spitting all around the room.
woodworking technique shop tip

Clean the nozzle as best you can after use, then store it submerged in fresh thinner in the sprayer's container. Before you start your next spraying job, pour out the thinner, and enjoy one less frustration.
—From the WOOD® magazine shop