Damp & Salt in Wall

[LstBld2020]

Hi

I have recently bought a house and one of the walls had decaying plaster & paint. It looks like the wall was previously damp and has salts in the wall. It still has some damp but i think they took care of the major issue although i think that some might be coming down from the old wooden windows so i will get this sorted soon. I was advised that i should go back to the stone so i have taken off the plaster and render ready for it to be re rendered/plastered. There are still some parts that have what looks like a previous treatment on the stone or a thin layer of render (see pictures) and i'm hoping i can leave this on and just go over it but let me know if not. I have read about things you can paint on but i don't think this would work as there are a few places where the pointing is gone and there is a bit of a void so i was thinking about some type of render with a damp and salt inhibitor in it. I just wanted to get some opinions of what product(s) would be good to use for this to ensure there are no issues with damp or salts.

Thanks in advance

 

[JessThePlasterer]

Now you’ve got this far you could clean up the stone, repoint with lime mortar and leave it exposed?

or lime render it. Breathable with the stone. Don’t take cement near it

 

[S a plastering]

Easi fill it all might takectime but works

 

[Retired Spread]

another one for @John j Bonding slap n dash guru