I think my whetstone has smoothed over by constant use at work, is there a way to repair it or should I just go buy another?
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2What kind of whetstone is this - oilstone, ceramic waterstone, soft synthetic waterstone, natural waterstone? – rackandboneman May 01 '18 at 20:39
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a photo would be helpful – Cos Callis May 01 '18 at 20:55
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I believe it is a natural whetstone, would a flattening stone help at all? – Jade So May 01 '18 at 22:40
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Picture, please? Is it circular, cylindrical, cuboid? What material is it made of? – Fabby May 02 '18 at 20:12
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Do you wet the stone before use? Oil it occasionally? – rackandboneman May 02 '18 at 21:02
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I do the full soak in water till no air bubbles rise, also I'm away formwork so I can get a picture yet. It's a rectangular double grain two sided whetstone either all natural or half natural half ceramic. – Jade So May 02 '18 at 21:04
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2A waterstone it is then ... most of them should rarely get clogged as badly as you describe... and yes, in most cases a flattening stone will be effective on these. – rackandboneman May 03 '18 at 21:06
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Use a nagura flattening stone to remove as much material as required.

ThatDataGuy
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Anything flat and abrasive should work. I am using some flattened clinker bricks to flatten whetstones for sharpening woodworking tools, but a sheet of sandpaper on a piece of glass also works. Probably even a piece of concrete... – Matthias Brandl Jul 28 '20 at 12:49