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If in doubt use tape. Worst that happens is you set a micro bevel which should only make it easier for you. Good luck

I'm with David your 12k should work but you will be trading time and laps for the convenience of a lower grit stone.

Yeah that sounds strange I've only used mine a bit but still haven't seen any grey yet.

The crox is usually about .5 micron and the iron oxide is about .1 micron. So the progression would be hone, crox then feox. I take it this is from whipped dog?