Use two coats of undercoat paint, it could be Crown covermatt or Superfast paint from Duracoat. You could utilize the ultimate coat of vinyl matt paint or some other decorations like wallpaper, murals or textured paints. Tape all joints by using a special self-adhesive tape identified as gypsum fiber tape. https://daltonco4s5.newbigblog.com/38385980/getting-my-gypsum-board-installation-to-work