Phosphorescent paint. Glo-paint as I call it. The liquid form of glowtape. I would paint the whole set in glo-paint so we wouldn't need any lights! For wiz oz I tried to paint spike marks instead of using tape, and the lines were really sloppy! (Plus I watered down the paint WAY too much. [considering it isn't supposed to be watered down at all]) Let ye all learn from my mistakes!