For the last year or so I have been mostly using the scary sharp method for plane irons. One thing I have noticed is that I can never get the backside of the iron truly flat. There always seems to be a slight radius on the cutting edge instead of a true flat. I am thinking that possibly the sandpaper substrate is compressing and rolling up slightly in front of the iron as I sand. I am not gluing the sandpaper to my tile just laying it on top while holding it with the other hand. Does anyone suppose that this is the cause? Any comments or suggestions would help.
Gene