The Mag polish will eventually work and produce a mirror finish. The Polish is designed to polish aluminum which is of course much softer than a good knife steel. The knife bevel should be very smooth to start with or you will be at it all day. Comparing the finish it produced with the finish provided by the Spyderco extra fine ceramic rods it appears to be slightly finer than 3 microns. I have no idea what the specific abrasive is but it appears to constitute only a small percentage of the total volume of the polish so you will be at it for a while. Having tried lapping compounds, rouges of various colors and grits, metal polishes etc. because they were available locally, the most satisfactory results was with the Mothers Mag polish.
Unfortunately the more expensive and less easily obtained high quality diamond pastes, spray and chromium oxide slurry work MANY times faster, easier and IMO produce much better and consistent results. One again the experts were right. OldDude1