My first post here ever, so please redirect me if this same question is answered elsewhere.
For the last couple of years I've been trying to dive into the field of japanese knife sharpening, aquiring three Shapton stones 140, 1000 and 3000 grit, and a Naniwa Super Stone 8000 (yeah the setup is not ideal, I know).
This has worked pretty well, exept for the Naniwa stone. I'm seriously starting to have doubts about how good it is in the first place.
It's almost impossible to create any slurry on it. More often the surface of the stone just gets a black shiny layer from the carbon steel which seem to just seal the surface permanently.
I thought maybe the stone had some layer of resin or something which needed to be removed, but the same thing ocurred after taking the original surface off with a flattening stone.
It was aquired to give my deba a mirror finish. Now it looks like it's smeared in vaseline instead.