You've successfully removed the wallpaper from your walls, but find that walls underneath are not in good shape to be painted. Walls may have holes, uneven textures or just not be smooth. Eric Stromer gives instruction on how to properly prepare walls to paint after wallpaper removal. Start by adding a skim coat to the walls using a 12 inch drywall blade and joint compound. Then grab a pole sander and give the wall a good sanding, hitting all the high spots. Wipe down with wet cloths to get rid of the dust. Now your walls are uniform and smooth and ready for a fresh coat of paint.