Preparing Wallpapered Walls For Painting. It takes up to 8 hours for the first coat of paint to dry. Sand the walls with a sanding block wrapped in 120-grit sandpaper.
If you encounter wallpaper thats been painted over first try the wallpaper stripping techniques recommended at right. If the wallpaper has a texture you dont want to detect through the paint the whole wall should be sanded until smooth using either a palm or orbital sander. Use a chemical wallpaper remover or rent a steamer if necessary.
If you want you can buy them at stores like Amazon to spray paint your walls much like wallpaper.
There are also the wallpaper stencil available at Amazon for painting walls with patterns stripes flowers and shapes. The same rule applies if you used a primer. Sand the walls with a sanding block wrapped in 120-grit sandpaper. Wash the wall down with sugar soap thoroughly then with a damp clothgive the wall a good rub down then apply filler to bad areas give a coat of paint then rub down and fill again repeat the process 1 more time and you should end up with perfect walls Answered 10th.