The KILZ Stain Blocking 5-gal. Flat Ceiling Paint and Primer is suitable for application on smooth and textured interior ceilings to help hide stains. The water-base formula primes and paints in a single step while reducing spatter for a beautiful result. The stain blocking formula can cover light to medium stains for an even appearance and the flat sheen provides an elegant look. Covers up to 1,500 sq. ft.