Hi, Need an advice if someone can throw light as I am stuck in between while painting my bathroom ceiling. Issue desc had peeling on the ceiling(plasterboard)I scrapped off the loose paint from area affected .applied two coats of primer& undercoat on the board. Now I was about to apply paint ,realised the surface is still not smooth. Can anyone suggest what shud do to first smoothen the surface before applying paint.surface looks like this currently as in attached. I am quiet new to it so any help is very much appreciated.