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Add a spray of 2 micron CBN slurry (water based) to the stone slurry. This enhances stone slurry formation to a higher density and if there is any refinement of the mud it will occur more quickly as the CBN breaks down the mud towards a higher level of refinement. Also the coarser scratches will occur when the steel is directly on the stone before the more refined mud acts as a cushion, so, as Adam has emphasized and demonstrates in his video, a light touch helps here too. Lighter touch helps minimize unnecessary burr formation - a good thing IMO. CBN - selected here as slightly finer than the stone's grit, makes the edge refinement go much more quickly especially with steels with harder carbides like Vanadium, (but with carbides in general, eg AS), where carbide abrasion in addition to carbide fallout is now occurring with the CBN vs the lower Moh's hardness abrasives in the stone alone that are incapable of cutting carbides.
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