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Yes you can use up a fair amount sandpaper. I will wash it off a few times as I am lapping to get a little more use out of each sheet. The gird lines is an interesting way of checking your progress....

I am not sure why you would not want to use sandpaper. It's not like they are all warped or anything. I take sandpaper to every hone I get to dress up the surface for use. Try starting with 600 grit...

Use a high grit sandpaper to flatten the hones on a hard flat surface. Two like or similar grit hones can be used to lap together to make a slurry. I personally do not use this method to hone a...