I use whatever grit is within arms length, usually 100 or 120, or maybe 180 (if the cut was already pretty clean to begin with). You're just taking off the sharp edge there's no need to polish it. The end result won't look like a piece out of a pro glass shop with a nice rounded edge, just something that's no longer sharp.
Wet is preferable to keep the dust under control.
Wrapping the sandpaper around a wooden block is a good idea. Also, wear gloves.
I've also used one of those 'diamond' knife sharpeners and it worked pretty well.
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