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They are ultra-slow cutters so you'll have to use the 4k. In general, 4k is the bread and butter bevel-forming tool. 8k is for polishing the edge. Do an actual pyramid and finish off with 3x 1-7....

I have been using slipstones and they worked just fine for my first few edges until I could finally afford a Norton.. Here are a few tips..
1) You can lap them against each other
2) They cut SLOWLY...