Thread: Comparing the Naniwa Pro and the Naniwa Specialy lines

Several vendors claim the Professional line as well as the Chosera line uses "magnesia" or "magnesium" as the binder. They also claim the SS line uses "resin" bonding. The Chosera line is still available but only for the Japanese market and only in the thinner size on fixed bases.

Originally Posted by Wirm

Several vendors claim the Professional line as well as the Chosera line uses "magnesia" or "magnesium" as the binder. They also claim the SS line uses "resin" bonding. The Chosera line is still available but only for the Japanese market and only in the thinner size on fixed bases.

That is what I was given to understand when I bought mine. TBH the reason I sold my Shapton Pros, my Naniwa SuperStones was because the polymer binder, or whatever, caused them to always need lapping every time I took them out to hone.

Even if I put them away absolutely flat. Not so the Norton 4 & 8 single grit hones. They only need lapping when they are dishing. Unfortunately the Choseras (mine) are no better in that regard than the pros or the supers. Live and learn ...........

HERE is a thread about the lapping issue with SuperStones.

The upshot lesson from all of that thread was that the hones needed to be treated the same way each time. I have found that I prefer to soak them for a few minutes, hone on them, and then gently lap them before putting them away. The rationale for this was to lap/refresh the hones after they have been wet for a longer period of time. Another option would be to lap/refresh it after soaking but before honing. The advantage of this way would be that you have fresh slurry available on the hone. The reason that I don't do this method is that I have found a better uniformity in the hones' swelling when they have been wet a little longer, as they are after finishing the honing.

After a few year's on Shapton glass I switched to Chosera 1,10k and the 5k pro.
I really like these stones, they are thirsty, soft and excellent with a slurry.
I know you can use the 10k dry?
Never used the superstone .

Recently due to my stones cracking I went back to my nagura progression, holy cow, buttery smooth edges.
I can't believe I spent so long on synthetics.