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Just make sure you use it in like half teaspoon bursts dispersed. More isn't more, you end up with your edges more out if you do that with sic but so long as you have good habits using it, you can...

You need sic, it will kill that diamond plate

Those are awesome stones... They can eat metal. Plus, yoir example doesn't seem to be a rat's nest of fissures

Yellow muddy slurry? pierre du sud ouest most likely