This is an example of wallpapering on a sand wall. Many people say that sand walls develop stains and sand falls off over the years, which makes it hard to look at and also makes it difficult to clean. You can either repaint it or use wallpaper. If you apply wallpaper directly on top of the sand wall, it will peel off, so we lay down a plywood board to create a base. If you apply wallpaper on top of that, it will not peel off. The room has been transformed into a bright one, as shown in the photo.