Good luck with not busting through the clear on the rivets I would try to cut most of the hardcore buffing out by using a GOOD clear coat some prefer PPG or Sikkens just depending on $$$ and personal preference. With a good clear minimal buffing is required in most booths as long as fans are pulled over clear for a proper cure time.I am not sure what kind of finish you are looking for but with a Hummer you propably would like something close to perfect so I would not cut your own throat by skimping out on clear coat and go with a decent setup. Typically 2-3 coats are good but more can be applied (i.e. 3-4) as long as curing procedures are followed. Sorry to be so long but I live for paint and body!