Sharpie Medium Point Oil-Based Opaque Paint Markers 2/Pkg - Sanford-Sharpie Medium Point Oil Based Opaque Paint Markers: White. Opaque paint markers mark on virtually any surface such as: metal, pottery, wood, rubber, glass, plastic, stone and more. Quick-drying and fade resistant. This package contains two oil based white opaque paint markers with a medium sized tip. Non-toxic. Conforms to ASTM D 4236. Imported.