What is this render?

[Mynameismike]

Removed shot plaster which was sand/cement. Below it is a piece of wall which was always having issues - paint was always coming off so I thought to remove some of that at the same time and re do with sand cement and finish. However unlike most of the other walls in the house this has a mass of this pink stuff on it. Could this be the cause of the constant lack of paint adhearance? What is it should I just take it off to sand cement the lot? It has soft consistency.

 

[footprints]

Wall is damp the plaster is rotten (become hygroscopic) needs stripping off and the source of the damp found.
Might be failed DPC, ground level too high outside or a leaking pipe outside.

May be the DPC has been done badly and the lower half re-plastered before.

 

[Mynameismike]

Thanks, yes it historically had the injected ‘damp proof course’ outside (Previous owner did it) which I know now is just a big scam. Had a plasterer deal with some other bits of damp 10 years ago, all caused by shot pointing outside. He used sand/cement and finishing plaster and not had any problems with those bits since. Outside there was some dodgy pointing which should be sorted now so think it’s a case they used the pink stuff rather than go the trad rendering root when they ‘fixed’ it with dpc last time. Oh well off it will come then.