There'a an ancient bendcrete bouldering wall at my place of work. Not a great wall but handy for a quick sesh or an ARC session, perhaps a bit polished but nothing compared to say bas cuvier.
Tonight I find that some knob has been at it with something like a chisel & wire brush or an angle grinder either trying to make the holds bigger or reduce the polish.
The result is just like it would be on rock. A broken, gritty loose surface.
Did anybody on here used to build these walls & have any suggestions