Ideal for creating a custom interior chalkboard on multiple surfaces including wood, metal, masonry, drywall, plaster, glass, concrete, paperboard and hardboard Apply the oil-based formula over a hard surface for chalk writing on most indoor surfaces Covers between 95-120 sq. ft ...Ideal for creating a custom interior chalkboard on multiple surfaces including wood, metal, masonry, drywall, plaster, glass, concrete, paperboard and hardboard Apply the oil-based formula over a hard surface for chalk writing on most indoor surfaces Covers between 95-120 sq. ft and dries to the touch in 30 minutes Creates a chalkboard that is scratch resistant, smooth and erases easily after use For optimal results before writing on surface, wait 24 hours after application and condition surface for use by rubbing side of chalk over surface and erasing Soap & water clean up