Rust-Oleum 290971 Zinsser All-Purpose Primer, 13 Oz Aerosol Can, Liquid, Gray N/A Imported Interior/Exterior use on new or previously painted drywall, concrete, wood, masonry, metal and glossy or difficult surfaces Oil-based formula seals uniformly and will stick to surface without sanding Dries to the touch in just 30 minutes and covers up to 12 sq. ft. Has excellent stain blocking resistance and can be used over any oil or latex topcoat Gray color of primer works great under vibrant, vivid colors saving time and money by improving hide and coverage of deep topcoats