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Yup, that is what you need, or you will be making very large grit jumps.

Not saying it can’t be done, just hard for a new honer, you have to say on each stone until you remove all the previous...

That is a natural Chinese stone. It may or may not be up to 12k, most probably not. Natural stones cannot be grit rated because they are natural, and there was no quality control when they were made,...