Borium, which is brazing alloy with chunks of
carbide for traction, comes in many grip sizes. Many farriers only have
the really large size, because that is what the arena jumpers want. When I
have sharp shod for ice, I had the farrier put toe, and heel dots of really
fine. He needed a weeks notice so he could order fine grade. Worked
great. Gave traction on ice, and concrete pavement with no problems.
Same thing would work on rock.
Ed
Ed & Wendy Hauser 2994 Mittower
Road Victor, MT 59875