When I was building custom 1911's on the side, I did a lot of hand checkering from 20 to 50 LPI. I had occasion to have it hard chromed, nytexed (electroless nickle) and hard anodized. I always bead blasted it pretty coarse on the front and back prior to polishing the sides of the frame, even when bluing. It always came out well. But on the coarser variety, 20 LPI, if you didn't blast it, it would be sharper than most people really want. I don't think that's a problem with the finer varieties from 30 to 50 LPI.