Thread: "Super" Stone Fail!

I know many of us use the Naniwa Super Stones, and to be quite honest, up until today I have been very pleased. Very pleased. They are great stones. But today my faith has been shaken.

I bought the combo 3K/8K (3/8) stone to save some space in my progression... but I am thinking that might have been a really bad call.

I don't "soak" my stones for very long. Generally speaking, I place my 3/8 in the sink while I work with my 1K. Then place my 10K in the sink when I begin using my 8K etc., etc. So the max it's in the sink is 5 to ten minutes (I only hone one razor at a time).

Today however, I saw a stream of bubbles coming out from the seams when I put it in the sink. I immediately took it out, but didn't think too much more about it until I began working with it. When I looked closer, I noted that the bonding agent was disintegrating and leaving a bit of an opening where the glue once was. No big deal really.

I did my work and when I was done cleaned it off with my lapping stone and placed it on my "drying" rack to let it dry with all the others.

It was when I was putting them away that I noted I had a problem. Not only was the glue disintegrating, the two bonded stones were pulling away from each other!! Massive fail!

Here have a look:


Bonds going.


Massive warping!


I have never heard of this happening before!? I am going to contact the company who sold it to me with a link to this thread to see if they have an in with Naniwa - hopefully they can return it for a refund because flattening this out, assuming it doesn't warp even more, is going to take quite a few hones out of its life.

What a disappointment...