I have removed tiles and most of the plaster has come away. It is an old brick wall, looks like grey cement wall at the back. I have large patches of up to 2-3 mm deep. How should I approach this ? Do I need a Bonding Plaster 1st and then a top finishing plaster ?
Pat
Answer
Hi Pat
Yes level the patches out with bonding coat. Make sure the edges are damped down with water or PVA to ensure the suction is not too great - if it is high suction then the bonding coat will shrink and crack away. Flatten whole wall within a few millimetres and then skim as normal.