Bedroom is being redecorated. Layers of old wallpaper have been removed. I've filled any holes and patches with ronseal wall filler and sanded them down. The plan is to line the walls with lining paper and then paint over. I've pored over forums but still don't have enough information and I've never hung wallpaper before! Questions: 1. What grade lining paper? 1200-1400 seems usual. 2, Do I still need to size the walls with wallpaper paste (and allow to dry for 24 hrs)? 3. Should I use Zinsser Gardz instead? 4. Is Erfurt Fibreliner overkill? Should I stick to standard liner paper? 5. Do I need to thin the first coat of paint?