Zinssers 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 on