On 19 Aug, 08:40, stuart noble wrote:
Given that it is due to be painted I would have suspected that SBR
would not be a problem in most cases and after application it could be
sanded to a smooth finish which would leave some original stone not
pitted without SBR and in its natural state
Chris G

I've used SBR in a cement slurry and it's not easy to sand. It's classed
as a synthetic rubber after all.

Good point but with patience and good machines one can do it
I accept it wont be a smooth transition from surface to pit but if
done weak enought to just stick in the holes (which is where its
wanted) I suspect from the sanding I have done with it incorporated
into finish plaster you will get away with it
One point I missed and that was to add some Portland cement to the
fine sand/stone dust
Mea culpa
Chris G