I started with 1000, and then did another round with 1500, both wet. The 1500 made it much less work with the buffer, it didn't need to cut nearly as much, and I found the sanding to be easier on the arms than the buffing (possibly because Jen helped sand, but won't use the buffer).Also, when you take off the oxidation with 600 and then 1000 sandpaper, are you wet sanding?