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Actually that's not him. So is Japan-tool.com

So's very pragmatic & unless he's changed his mind since we last spoke he'd recommend a synthetic till 6k or 8k for razors. The Suita I first bought from him was to fit that role.

Yep the 'right" Suita could do the job but at 2-3x the cost & time of a good 1k.
Personally I've used my Tsushima brick also but could do the job in half the time on my Shapton.

There are synthetics not far off diamond speed but less destructive on edges which, can make the process faster.


Sometimes yes, but not always a guarantee of a fast cutter. A hard coti can also...