Melt the wax in a slow cooker on "keep warm" (under 120° F); remove from heat. Have each kid coat one hand in Vaseline and dip it in ice water, then wax. Repeat several times. When the wax has set, it will come off like a glove. Girls Sizzling Devil Costume, $30, Devil Tail and Horns, $9, and pitchfork, $3, Celebrate Express.