If you want the very finest sharpening job done on your expensive shears this is it.
This method is used at the factories in Japan to polish the edge of high quality convex shears to be razor sharp.
Almost all sharpeners use a Flat Hone to sharpen convex shears.
Flat hones will sharpen convex shears. I know as I have three flat hones that I use.
I have a Kuda, Hira-To and a Scimech these are all expensive machines that cost thousands.
Do they sharpen? Yes. Do they heat up the steel? Yes.
All sharpeners try not to but it just happens when using a flat hone.
Using water when sharpening keeps the metal cool so that your shears will stay sharp longer.
So why don't more sharpeners use a HoYo Sharpener and Japanese waterstones?
Cost, Availability and Ability.