A paint marker is a type of marker pen that is used to create permanent writing on a variety of surfaces from paper to metal to stone.
Unlike most permanent markers the ink is an oil based paint and generally requires shaking before use, similar to an aerosol spray paint can. Paint markers like permanent markers generally contain the toxic compounds xylene or toluene and require some safety when used.
Like spray paint these markers give off volatile organic compounds and should be used in a well ventilated area or with a particulate mask. Gloves should also be worn to avoid absorption through the skin. Also like spray paint these types of markers are not truly permanent as they can be removed using high pressure cleaning, paint thinning solvents such as acetone, or they can simply be painted over.