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The Swatys that I've owned have been consistent material on both sides. I have actually surfaced them coarser and finer on both sides, and both sides react the same. So yes, I can say with a fair...

Yep, it's gotta be smoooooth to do its job right. And yes, leaving one side lapped coarser will cause that side to cut coarser/faster. This is true too for any very hard hone that doesn't give up...