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Originally Posted by Bill Harsey
I don't use any liquid on the diamond stones because, I think, there is more space between the points on the surface and they don't plug up like other stones. diamond doesn't care if there is a lubricating oil on the surface or not for hand held stone uses.
Lubricating/cooling oils are critical for making diamond grinding wheels last when production grinding of carbide tooling.
I do wash off my fine diamond stones after hard use with the WD-40 spray method. Soap and water would float the grit out to.
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The instructions that came with my DMT diamond stone said specifically to use it dry and only use soap/water for cleanup. I've done exactly this and the stone is still going strong after two years of use.