I always maintain the edge by stropping one or two degrees behind the cutting edge angle to allow the pliable leather to conform to the curve without applying pressure to the edge itself. A couple feather-light strokes at the actual cutting edge to polish it off seems to do the trick. As Tom has said, it’s important to use a very light touch on the actual cutting edge angle to avoid further widening of the edge.
After creating the convex edge how do you maintain the edge? Touching up all angles or just the edge? Or anything in between? Hope this isn’t too dumb a question!
