Select a latex paint to use over the PVA primer. You will need about 1 gallon for 400 sq. ft. of ceiling.
Prepare the room for painting by removing as much clutter as possible, covering the floors and clustering the remaining furniture in the center under a dropcloth. Use tape around the edges of the ceiling where you don't want paint to go. Lower the light fixture, if possible, so you can paint around it.
Attach your roller brush to a roller pole and dip the brush into your paint. Smooth the paint onto the ceiling being sure to use a light hand and even strokes. Cover the entire ceiling except the outer edges. Cut in the outer edges using a bristle paintbrush. Allow the paint to dry completely according to the package instructions.