Marking pens create highly visible, permanent, marks on surfaces to identify and organize equipment and parts. Paint pens are permanent, oil-based opaque markers available in a variety of colors. Pens are easy to apply and are used on metal, ceramic, wood, glass, plastic, and stone. Enamel-based markers have excellent chemical resistance and are fast drying to allow for immediate handling. Marking pens come in a range of tip sizes from bold to medium to fine to create desired lines. Most marking pens can be used on dirty or rusty surfaces.