I've spent 2 days wet sanding the whole rear end of mine
didnt use a paint gauge...why?... because ive just had a respray so i know it hasnt been done before (except by the painter but not enough imo) but i know my limits
keep the sandpaper very wet, i reccomend using a sanding block so its even, i used 2500 grit
and rotary takes more skill and is easier to mess up compared to a da so just be very very careful
i tend to get most of it buffed out with a da, then go over it by hand just to make sure i havent missed anything
take the number plate off and do behind that first, if u mess up then no biggie
Before
http://s647.photobucket.com/user/fathead411/media/null_zps7381d054.jpg.html
After
http://s647.photobucket.com/user/fathead411/media/null_zpsfbe27c58.jpg.html