Ahhhh, I'm happy to hear the spirit of "Metal Illness" lives on in the hearts, minds, and sore backs and black-stained hands of polishers everywhere.
On the topic of the Scotchbrite finish - not a great idea. True, the Sonex prototypes wore a Scotchbrite finish for a while and that is how I (we, at Sonex Aircraft) know it is a bad idea. The unfinished finish holds moisture, collects sunscreen, sweaty hand prints, etc, and that results in stains and corrosion, requiring constant upkeep.
Two final thoughts:
1. I was frequently asked when I was done polishing. I was done polishing the day I sold my airplane, "Metal Illness."
2. Marty Smiltneek, another early Sonex builder and friend, offered me these wise words, "If you paint, it will never look better than it does the moment it leaves the paint booth. If you polish, it can look better and better all the time."
Blue Skies!
Kerry Fores
Builder, "Metal Illness"
http://www.TheLifeOfDanger.com