Sanford-Sharpie Medium Point Oil Based Opaque Paint Markers: Black, Gold, Red, Silver And 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 five oil based opaque paint markers with a medium sized tip. Non-toxic. Conforms to ASTM D 4236. Imported.