Quote Originally Posted by DrNaka View Post
I will recommend Cyanoacrylate adhesives.
They are sold as brand names of Loctite (sp?), Krazy Glue, Super Glue etc.

Cyanoacrylate - Wikipedia, the free encyclopedia

I use it for mending small cracks in Jnats.
They are also good to fill in some Su of a nearly Su-less Suita.
Or if you dig a 針 "needle" a small toxic inclusion.

But if your digged line is broad and deep you may not fill it all. But still it will prevent the water to penetrate under the surface layer.

Apply the adhesive 2 or 3 times to be sure it has covered all vertical sides.
Dr Naka, thanks for responding.

You can see my stone in my message above. The line
is deep, but de line is not broad.

Dr Naka, what do you think about his idea?
to create a lot of slurry with a tomonagura and let it
dry. After drying I could mix the slurry powder with the
super glue and fill the gap?

This way the closed gap will also have the colour of the
stone because the gap is filled with the particles of the stone
itself. Also the feeling(while sharpening on the spot of the old line)
will be more the same.

What do you think?

Sharpman