Zinsser Smart Prime Water-Based Primer & Sealer in White combines dependable stain blocking with smooth flow and leveling for interior and exterior painting projects. Its low-odor, low-VOC formula seals porous materials and bonds to clean, sound glossy surfaces without scuff sanding, helping your topcoat cover evenly. Use it on properly prepared wood, drywall, plaster, masonry, metal and other compatible surfaces to block common water, smoke and tannin stains. The dried primer film resists mold and mildew. This 1 gallon container covers approximately 400 sq. ft., depending on surface porosity and application. Under recommended conditions, it dries to the touch in 30 minutes and can generally be recoated in one hour. Allow two hours for interior stain blocking and 24 hours on new cedar or redwood. Apply by brush, roller or sprayer, then clean tools promptly with warm water and detergent.