The wall surface should be:
- Free of mildew, grease, or other stains
If the paint is old or flaking, then preparing the surface and painting it correctly is highly recommended. Old wallpaper and adhesive should be removed by sanding, or adhesive remover and primer should be applied to the clean, smooth wall surface prior to application. Applying a Wall Covering or Poster to paneling, or wall currently covered with wallpaper, is not recommended.