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Just ordered some 60 and 120 grit SiC fromt he link Srdjan provided, I will update with the results.

Wish me luck!

What SIC grit would you recommend for the cretan?

I thought about using SIC but it is pretty hard to find some here in Greece.

First time in my life I was looking for a coarser natural hone and it ended up being a finisher...

If I find no use for it I will let you know Philipp.

So I received my cretan today and I went straight to dry 50 grit sandpaper to flatten it. Well guess what, this @@@@ rock won't lapp.....

I spent almost 2 hours on good quality 50 and 80 grit...