Mix 3 ounces of TSP, 1 ounce of laundry detergent, 1 quart of bleach and 3 quarts of warm water in a bucket. Scrub the walls with the solution, using a brush, to remove all surface debris. Sponge the wall down with a bucket of fresh water to remove all of the TSP solution. Allow the wall to dry for 48 hours using a fan and an open window in the room.
Apply painter's tape to the floor and ceiling and on the outer edge of any fixtures attached to the wall. Cover the floor with plastic sheeting to catch any drips.
Mix the masonry primer well and pour it into a paint tray. Paint the wall with one thin primer coat via a long-handled paint roller. Always lead with a wet edge. Spread the paint onto unpainted wall sections, then back onto painted sections with horizontal or vertical strokes.
Allow the primer to dry for the label-recommended amount of time (usually 12 hours) before applying the topcoat.
Apply the topcoat following the directions for the primer coat. If desired or dictated by the paint's label, you may add another coat after the appropriate drying time has elapsed.