On 29-Jul-17 2:41 PM, newshound wrote:
....
Sounds like a plausible idea. The other thing you might think about is
ways to improve the keying. For example you could drill some holes in
the face to be repaired, insert plastic wallplugs, and then put in some
screws protruding a certain amount from the surface. I think I would use
stainless steel screws....

I suspect that stainless steel would not have enough oxygen reaching it
to keep the protective surface coating intact. That would mean it will
rust just as quickly as mild steel. I would use a non-ferrous metal
bonded to the existing stonework with epoxy resin.


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Colin Bignell