12k, depending on the razor 10 to 20 laps (20 for harder steel). Then test. Don't go down in grit unless you HAVE to. If it still needs it after the 10 (or 20) laps, try another 10, test, and then if needed another 10. If that doesn't bring it back THEN go lower in grit and do a pyramid with the 8 and the 12.