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My 4k has micro pits that have swarf lodged in them that destroy the delicate edge of a razor. It happens enough and so dependably that it is unusable for my honing needs. The first few layers were...

Yes, I think so (I have Naniwa SS 3k & 5k, the Norton 220/1000 & 4k/8k (4k is not usable)). When my 4k was working it was definitely faster.