Noob question about 'touch-ups'
In one good thread, Hi Bud GL mentioned 'I assume you know what a touch-up is'. I can't say I do. What condition exists when an edge needs a touch up? Here is where the barber hone seems to have it's reason for being, but I can't say I know what makes for a touch-up vs another few strokes on an 8k or 12k.
When touching up, is this a trip to the stone(s) for the entire length of edge? Just a portion?. I've often found one section to be less sharp than others. I would think working just that section would make sense, but I'm not experienced there.
Thanks again for your kind help w/ the noob questions.