Need to cover up less than pretty walls. They have been patched and repaired over the years, but the plaster is pretty sound, although it's not nice pink plaster more of a gritty stone colour. There has been a damp proof added to this room and consequently there is different plaster up to about waist height. I have sanded and repaired as best I can, but will need something to really give it the best finish. Decorators merchants have recommended Wallrock. Has anyone used this stuff or am I best to use the heaviest weight standard lining paper which I may have also to cross line?