Sharpie® Paint Marker, Oil Based, Medium, Red Ink Sharpie Paint Markers Are Perfect For All Use Cases. The Oil-Based Ink Is Ideal For Porous And Non-Porous Surfaces Ranging From Concrete, Rock, Metal, Glass, Paper, Or Cardboard. Quick Drying Oil Based Ink Resists Fading, Smearing And Water. High Contrast Colors Create Opaque And Glossy Marks That Stand Out On Dark, Light And Reflective Surfaces.