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I'm sure you could use lower grit, but I've use 600 in the past and it worked quite well. It took a little bit of time to do the 4k side, but the 8k side was done in only about 3 or 4 mins.

Soon...

you can used wet/dry sandpaper (quality: Norton of 3m brand) on a flat surface - as demonstrated in the wiki, you can do it on a flat tile of countertop...use the sandpaper wet of course.

if you...