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Why you'd try to properly lap a stone with the 1200 is beyond me. Stu's advice is sound there.

However, as oz says, for generating slurry (which if done regularly also keeps the stone flat) the...

It depends on what you are lapping IMO. I have both the 400 and 1200 Atomas and both get used for lapping. Anything under an 8k, I use the 400 generally. I mainly use the 1200 to lap, clean, and...