You can also view previously answered questions in the HSW Question Archive . The ceilings of many homes and apartments are not painted, but instead are coated with a substance that has a bumpy texture. It hides lots of imperfections in the ceiling. The ceiling is a huge, flat, uninterrupted and well-lit expanse.
Any imperfection is immediately obvious.
The texturing hides imperfections very effectively. It helps eliminate echo in a room. If you have ever talked in a room before and after carpeting, you know what a big difference carpet makes on echoes. An acoustic finish is like carpeting the ceiling. The mixture is then sprayed onto the ceiling using a special spray gun like this hopper texture gun .