Nice to see you on the forums again, Javan. Hope all is well.
I don't know about the durability of the handle coating. We'll see. I chose a urethane because urethanes, in general, have excellent adhesion to difficult substrates, very high abrasion resistance, and high tensile strength for elastomers. The firmness of the coating feels similar to a car tire (fairly hard), but the sand makes the surface rough (about like 300 grit sandpaper). I'll post updates about the apparent durability once I've used it a bit.
It looks like it has a scandi grind in the second photo because of the sandblasting. I sandblasted the knife to improve the adhesion of the urethane rubber, and I decided, on a lark, to go ahead and sandblast part of the blade in addition to the tang. I masked the edge of the blade with tape, so the area within about 1 cm of the edge still looks shiny.
No, I didn't test the HRC. I'm just passing along the manufacturer's specs. I don't have a reason to doubt them, and if it differs by a few HRC units from the published specs it isn't important to me.