Just a query for any pro's reading this post. I was at my son in law' s dad's house today and he was sizing his living room wall with normal mix paste prior to lining. He said he preferred that method than watering down to a thin mix to minimise splashes, particularly on the ceiling. He also said that when his lining paper is up he sizes that prior to top paper. I have always lined underneath decorative paper but have never sized the lining paper and have always used a very watery size on plaster prior to lining. What are the pro's opinions on this. Many thanks.