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"Can I use wet dry sandpaper for the 500 on one side and for the full progression to 2k on the other?"

Yes, but if your stone is not flat, you will burn through a lot of sandpaper, time, and...

The problem with Dan’s is he sells a Hard black and an Ultra Fine Black. If you did not buy the stone new, you do not know which one you bought.

When ever you buy a used Ark, try it before you lap...