It will not only cover the ugly imperfections in the wall, but it will also give them a neat new look.
Bead board is lightweight and easy to work with, too.
Prep your walls by scraping off any rough edges of paint, plaster, construction adhesive or loose or peeling wallpaper. Recess any nails all the way into the wall, and brush away any debris. Be sure to wear safety glasses while scraping the walls. After you decide how high you want your board to reach, measure the perimeter of the room. These figures will determine how much board you need to buy.