Shell Busey Blog - Repair Stipple Ceiling - July 12th 2017
You can patch the stipple areas that were damaged by purchasing a can of stipple touch-up paint or spray at your local paint stores. I do recommend you practice on a scrap material to make sure it is the texture you want.
Your other option would be to remove the stipple all together, first you will want to cover floors with plastic and make a clear working space by removing the furniture. Next, in a spray bottle mix 1/2 Sudsy Ammonia and 1/2 warm water. It is easier if you purchase a 2-litre spray/mister from one of your local building supply stores. Mist a large area of the ceiling 4 feet x 8 feet section at a time. Mist the area a few times to ensure it is wet and let sit for fifteen minutes. The stipple should be bubbling/blistering and easy to scrap off. Be careful not to dig into the drywall with the blade of the scrapper, since this will damage it and a drywall repair will be required. This job requires patients so go slow, smooth and steady. It is important to make sure all the stipple base (chalky powder) is totally removed and vacuumed before priming and painting.