I am new to sanding metal.
I have worked an old blade upwards through the grits, from 100, 150, 220, 320, 600, 1200, 2000.

The blade looks much better, but the 2000 grit leaves tracks in the metal, and does not give it a mirror finish.

How do I get that mirror finish on the blade, what do I use after 2000 grit?