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The Tormek Japanese Waterstone is 4000 grit and delivers a mirror finish with hardly any visible marks.
Alan Holtham, English woodturner and journalist, tries the Tormek Japanese Waterstone SJ-250 for ultra-sharp edges (also available for T-4 and 1200 models as SJ-200) and the Tormek Blackstone Silicon SB-250 for faster cutting action on HSS and exotic alloys.
The Tormek Japanese Waterstone 4000 grit delivers a mirror finish with hardly any visible marks. Since the stone is made to create the finest surface, it has a limited steel removal capacity and cannot be used for shaping* a tool.
This waterstone excels at sharpening hand tools like carving tools, knives, scissors, plane irons and wood chisels where a minimum of steel removal is needed and a superior surface finish is demanded.
Its unique composition gives the stone an extremely long life. Since the surface left by the Japanese Waterstone is so fine, we do not recommend honing afterwards on the leather honing wheel.
You should clean the stone surface of steel particles every minute or so with the fine side of the Stone Grader SP-650. Do not use the coarse side of the Stone Grader on the Japanese Waterstone.
* A distinction should be made between the shaping and sharpening of a tool. When shaping you remove steel to achieve the shape and edge angle you want. When sharpening you just touch up an existing shape to renew the sharpness.