Uni-Paint PX-21 Oil-Based Paint Marker, Fine Point, White, 1-Count Unipaint Markers. Opaque oil-based paint for decorating, painting or personalizing almost any surface. Weatherproof, fade proof, acid-free. Individual Colors. Sold by the EA Unipaint Markers. Opaque oil-based paint for decorating, painting or personalizing almost any surface. Weatherproof, fadeproof, acid-free. Individual Colors. Sold by the EA