Zinsser Bulls Eye 1-2-3 Gray Water-Base Interior & Exterior Stain Blocking Primer, 1 Gal. is a versatile primer designed to prime and seal a wide variety of interior and exterior surfaces including new drywall, wood, masonry, metal, and glossy surfaces. It excels on hard-to-stick surfaces such as old glossy paints, clear finishes, metal, fiberglass, PVC, composites, glass, and tile. This primer seals and tones surfaces while resisting mold and mildew formation on both the underside and surface of the primer film, which helps prolong the life of your paint job. It also inhibits rust formation when applied over clean ferrous metals like iron and steel, eliminating the need for a separate rust-inhibitive primer. The primer dries to a smooth, tight film that resists flash rusting and long-term rust development, making it i for priming interior and exterior metalwork such as iron railings, steel doors, and metal panels. Compatible with both oil- and water-based paints, this water-based formula low odor and easy cleanup with soap and water. It can be tinted with many universal colorants and works especially well with rich or dark topcoat colors to improve hide and coverage. It dries in just one hour and covers approximately 450 square feet per gallon. Model Number: 285085