Soft type of mortar

[Lotarogg]

I have a stone cottage and the surround for the fire place is all stone, coursed but rough with deep pockets. It needs softening up but I also want to keep the rustic nature of it. I was thinking of a lime render but the stone work is already emulsioned. So I'm considering pointing the deep holes and gaps in the mortar and then going over it 5 or 6 times with emulsion. I don't want to use a cement based mortar I want something that will hold and fill but that could in the future be chipped out without too much bother.

Thanks

 

[Skimmers]

sharp sand cement and lime pointing mix sorted

 

[Lotarogg]

Cheers Skimmers but wont that set very very hard? I need something that sets like plaster but a few stages harder. There was some sort of lime plaster on it before which was solid but chipped off easy.