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There are folks who obsess about flatness of stones and want to keep their stones absolutely dead flat and claim that you can only get a straight edge from a dead flat surface.

But you don’t need...

Aaron, get it flat first with 60 grit, Zulus are hard, then work up the progression to 500. From there your slurry stone should take it the rest of the way.

Most Zulu’s I have seen were pretty...

Yup many ways to do it, for soft stones like slates and coticules, drywall screen is quick and easy.

For hard stones, 60 grit will get you flat in a few minutes. There are many threads, on...

Yup, you can get a progression of 60 grit to 500 grit for about $15 from Gotgrit.com.

60 grit will get to flat in 15-20 mins, but a soft stone like a slate, will get flat on 120 grit drywall...