You were almost there. You almost wiped out the hardcoat annodizing. Not much longer in the blast bin would have had it down to bare aluminum.
Been through this.
Scuffed some parts, 'eh... KILLED some parts, down to bare alu. Didn't take much more to crush all the anno off there and get to bare alu.
The coating will last much longer if it's adhered to bare metal, that's prepped correctly. I'm just sayin'.
I've done a few of these, and I'm Cerakote-exclusive now. I've "roughed" parts, and had the Cerakote come off from "rough handling" with a scope mount, on the pic rail. When I take that $hit down to bare metal, that $hit is harder than woodpecker lips. That $hit is so hard a cat can't scratch it, and diamonds are impervious. The more you go down... insert comment here... <lmao> ...the longer it will last.
If it's some customer $Hit, and you don't want a "comeback" from the coating getting chipped up or scraping - take that $hit to bare metal.
^^^ That advice goes to you, too, Shibi.