I have just removed wallpaper from a bedroom and rather than wallpaper again i now wish to paint the walls, which are in excellent condition now that i have filled in nail holes etc. I want to make a decent job of this and will put in the effort to have it looking good but should i apply the paint directly to walls that will have residual wallpaper paste or would it be a more professional finish if i were to take the trouble to line the walls and paint over the lining paper.