Industrial-grade paint formula for exceptional performance on oily and wet surfaces. Also writes on dry, smooth, or rough surfaces. Fast-drying, vibrant paint marks dry in 30 seconds to 1 minute on dry surfaces, does not smear when over stacking. Twist-up knob easily advances permanent solid paint to keep hands, clothing and toolboxes clean. Weather and UV-resistant for long lasting marks. Easy grip airtight cap for convenient pocket storage, self-storing cap keeps the marker clean and fresh between uses.