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All I can offer is one experience. It was an expensive coti that I couldn't get to "hit" no matter what ..... until I took a shave ready razor to it and after shaving with it once ... next day did...

If you have slurry on it and do back and forth strokes or circles does the slurry get dark with metal pretty quick or at all ? If it is a very hard coti it might be a 'finisher' or it may just be a...