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There is no simple answer to your question. The number of strokes required will depend on the speed and size of your Coticule and how much slurry and pressure you use. In any case, 20 strokes on...

Diamond slurry would be diamond particles in water or oil, used for polishing - you could buy some on ebay if you wish. I expect the OP means diamond spray.


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As Pieter said, 30 x-strokes on water or maybe 30 on very light slurry followed by 30 on water usually refreshes a Coticule edge.
You should not need the diamond or CrOx in addition (I imagine...