Zinsser's Bulls Eye¨ 1-2-3 Plus is a universal water-based primer, sealer and stain killer. It is ideal for interior and exterior painting projects. Bulls Eye¨ 1-2-3 Plus delivers performance benefits normally only associated with solvent-based primers, including exceptional adhesion and stain blocking. It is specially formulated to resist re-wetting, meaning it can block water soluble stains like a solvent-based primer and seal oil-soluble stains, meaning painting projects can be completed with just one primer. Uniquely, it can be applied directly over water and smoke stains.