Now I need to modify the bathroom walls, and bathroom has a popcorn ceiling, with a 1 inch piece of trim next to the ceiling around the room. Im contemplating using the paintball wallpaper, but i think I have to sand some of the paneling. What i want to know is what wallpaper adhesive should I use, and what preparation to the wall do I have to do if I sand it does it still need a BIN or Zinser primer after I sand Would I need the liner and if I do, what type do I buy and how do I decide to hang it adhesive under it, and then let it dry, and then do I need sizingTarget Expect More.