I am trying to remove wallpaper from a hallway. I have used dif and a "hole pricker", but nothing gets more than a quarter size piece off, most of the time. At the beginning several strips came off. I put the paper up myself years ago. My question -- can I use a couple of coats of Kilz over the rest, as long as I get the waslls smoothe. I am absolutely not up to days more of this. HELP!!