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Probably , depending on what you need doing.
I've used Namurian Rock to harden crumbly stone (after digging out the worst of it).
I had planned to rebuild with Conserv Repair Mortar (using a box frame), but ended up getting someone in, as I needed the sills ground down to create a runoff.
The repair person actually ended up using a lime mortar mix, with cement added - I think that was a bad move, but time will tell.
NotThamesWater
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Hello hive mind...
Refurbishing sandstone window cills? Can an amateur do a decent enough job?