Prime and seal a wide variety of interior and exterior surfaces such as new drywall, wood, masonry, metal, glossy surfaces, and more. It is great for hard-to-stick surfaces like old glossy paints and clear finishes, metal, fiberglass, PVC, composites and even glass and tile. Seals and tones the surface. Resistant to the formation of mold and mildew on the underside and surface of the primer film, prolonging the life of your paint job. Inhibits rust formation when applied over clean ferrous metal such as iron and steel, eliminating the need for a separate, rust inhibitive primer. It dries to a smooth, tight film and resists flash rusting. Inhibits long-term rust from developing under the primer film when dry, making it ideal for priming interior and exterior metalwork such as iron railings, steel doors, and metal panels. Use over or under oil or water-base paints. The water-based formula is a great all-purpose stain killer with low odor and easy soap and water cleanup. May be tinted with many universal colorants. Use the Gray Primer with rich or dark topcoat colors to improve their hide and coverage. Dries in 1 hour. 1 gallon covers approximately 450 Sq. Ft.