The house we have moved into has plasterboard walls, every one of which has been covered with painted lining paper that has been damaged by us having central heating pipes sunk in the walls and a complete rewire. Getting the lining paper off is taking ages and exposing what looks like a paper covering on the plasterboard?? Decorating will be be mix of emulsioned walls and wallpaper. I've seen posts on preparing the walls for paint using Gardz but nothing on preparing for wallpaper. Anyone got any advice on the best way to go about that please? Its my first house with plasterboard walls.