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These stones are porous, as I said earlier. Other than that, Neil pointed out about being inconsistant on the DMT's which is easy. It's always a good idea to finish on some Wet/Dry Sandpaper. Start...

That's bizzare. You say, you lapped already, used it once, or so, and now there's a bulge in it.
I just bought a Naniwa 12k myself, I lapped it with my DMT D8XX, then D8C, then 220, 320, 400, 600,...