And that, is the biggest difference in sharpening tools and knives, a nano serrated edge for most knives and tools is a good thing.

And why the hair test is so unreliable, a serrated edge will easily cut hair, but you will not want to shave with it.

Sharp is easy, it is comfort and smooth that is difficult with vintage razors. Sharp is only half of the issue. And you can’t cheat, by just polishing an edge. For example you can polish your highest grit edge to a smooth edge with other paste, but it probably will not hold up under shaving.

A good strong, keen and comfortable edge, must be built… like a house, beginning with a foundation…

Most folks do not understand how fragile a razor edge is.