I'm worried. I've recently heard that you shouldn't PVA plastered walls when planning to tile. Fair enough, I wont add PVA to our newly plastered walls. However, before the plastering, I did add PVA to the one plasterboard wall, which our plasterer has now skim-plastered over. I need to tile on this wall, and am now worried that his plaster may fall off the plasterboard...resulting in tiles coming down! Any ideas?