My next stones showed me something interesting.
I used a very light touch on the 400 grit sandpaper and used only one disk for all six.
Well, when I tried to sand on the 600 grit and went through three pads on one stone I realized what was wrong. I was too tired when I thought I was finished with the 400 grit but ended up leaving many ridges and tables. So, I went back to the 400 grit and finished up.
This tells me that I do need two sanding steps.
Also, considering one sanding pad is only good for 1-2 stones, carbide sanding pads aren't cost effective.
I'll know more after I go through the diamond abrasives book.
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