A tough marker for tough jobs, the Solid Marker is solidified paint in a marker stick. It marks through oil, grease, rust, mud, snow and more, and is great for inside or outside use. The paint dries within minutes, and is permanent once dry. The special twist mechanism that advances the paint keeps it fresh and ready to use. Ideal for use on wood, cloth, canvas, plastic, steel, iron, rubber, cardboard, glass, fiberglass and concrete. Alcohol based cleaners will remove ink from non-porous surfaces.