Testors Rust-Oleum Glow in the Dark paint is a luminous color that creates a glowing effect for up to 2 hours when charged by light. wood, metal, plaster, masonry or unglazed ceramic. Washes with soap and water. Fast-drying, for indoor use only. Glows a green color in the dark after charging with light. For best results apply over a white or light covered surface. Object will need to charge for several hours before the glowing effect will occur.