Omg! I just started sharpening my blades that way. Thought of it on my own. I thought about how the Creative Memories consultants said to sharpen the corner rounders with foil. I took about a 3" strip of foil, folded and folded it until I couldn't fold it anymore. Ran the rotary cutter back and forth over it back and forth and wow! It was like new!!!
I have been meaning to share it with the board but just never got around to it.