Remove all the furniture from the room and lay the plastic sheets on the floor.
Climb the ladder and vacuum the paintable wallpaper to remove any dust or cobwebs.
Pour the paint in the roller sheet and dip the paint roller into the paint. Move the roller back and forth until it’s covered with paint, but not dripping.
Apply the paint to the ceiling in a v-shaped motion, starting on the right side or the room if you are right-handed, and the left side of the room if you are left-handed. Apply paint to the entire wallpaper ceiling until it’s covered.
Allow the paint to dry for at least 24 hours.