I've just taken off the old tiles in my bathroom. Unfortunately behind the upper tiles is orginial plaster (horse hair etc.) This has crumbled and most of it has come off the wall. It appears that lower down a similar problem occured in the past, as this has been replastered.
There are no damp patches
As I am going to re-tile I want some advice on what to patch up this wall with. I have considered using thistle hardwall. But wasn't sure whether to then put a smoother top coat on as well.
Any advice and tips gratefully received.
Tim