Cover the cabinets and floors with a drop cloth. Wear goggles, a mask and a hair net to protect your face, eyes and hair from paint splatter and debris.
Scrape off loose and peeling paint with a metal scraper. Lightly sand the ceiling with medium-grit sandpaper.
Scrub any discolored areas with a mild detergent. Detergent will remove any unseen mold and prevent future mold growth. Let the ceiling dry completely.
Spray ceiling texture spray onto any areas that are missing texture. Apply a texture that matches the texture on the rest of the ceiling. Use a steady back-and -forth motion to apply the texture. Overlap each pass of the spray can. Add texture until the damaged part of the ceiling matches the rest.
Roll a medium-nap roller through the primer. Apply the primer in a thin, even coat. Let the first coat dry. Roll on coats of primer until you have completely covered any stains. Let the primer dry for four hours.
Paint the edges that the roller won't reach with a trim brush. Prepare for painting the entire ceiling, both the damaged and undamaged areas. Painting only the center will result in mismatched paint and may draw attention to the repair.
Paint the ceiling with a medium nap roller. Choose a flat, interior latex paint. Flat paints will blend different textures better than higher gloss paints. Roll on the paint in a straight line, overlapping each pass of the roller slightly. Let the paint dry and apply a second coat.