Jees I remember those days
the worst and most satisfying part of the Sumo build I did.
I colour sanded the whole car as the CSM impression was showing through the gel coat, fecking whore of a job
Process is the same whether doing the whole body or after doing the flash lines but basically wet n dry with 800 then 1200 then ferelca G7 (I think, was a long time ago now) and then T-Cut.
Polishing process with G7 and T-Cut was done with a mop attachment on a drill (polishing tools weren't really available back then to the DIYer - plus I was tight)
Took me about 3 months of part time work to do the whole body but it made such a difference. Deep shine and no CSM showing through, was well chuffed with the result and was worth all the pain.
During my ownership I noticed that most owners didn't do this to their Sumos (and other makes) but it does make such a difference to the finish.
John
Madabout-Kitcars.com