Step 2
On a covered surface in a well-ventilated area, place the craft foam balls that are 2.5 inches or bigger on the rim of a paper cup to set up for spraying. For the balls that are 2 inches and smaller, turn paper cups upside down, stick a wooden dowel into the center of the cup, and push the smaller balls on the other side of the dowel to keep the balls from moving while spraying.