The Phosphorescent "Glow in the Dark" marker has many uses and is reliable in its application.The tough marker for tough jobs, the Solid Marker is solidified paint in a marker form. It marks through dust, rust, mud, water – inside or outside. Dries within minutes, and is permanent once dry. Solid Markers won’t fade or wash off like chalk. The special “stay fresh” twist mechanism keeps paint fresh and ready to use. Ideal for use on wood, cloth & canvas, plastic, steel & iron, rubber, cardboard, glass, fiberglass & concrete. Solid marker features a tough, broad stroke, is quick-drying with low odor.