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As Ive allways used wet and dry i haven't put much thought into lapping stones to be honest but seeing this thread piqued my interest.

Forgive me if im wrong but ive always thought that if you use a low grit lapping stone on a finishing hone you would leave scratch marks on it which would reduce the effectiveness of it.

Wet and dry paper on my kitchen work top for me. Its cheap and effective for the few synthetics I own.
Job done:D