...wallpaper afterwards.? The walls where I live are quite bad with many imperfections, and I think I need to wallpaper them to hide the gauges and repairs they've had. I want to do the job right and I understand that the correct thing to do is to line the walls first. One friend said that the lining paper should be applied horizontally if a patterened paper is to be used after, but another friend said "no" they both go up vertically. Which is right please?