[RedBarchetta]

It's not that simple...paint doesn't oxidize as quickly as bare aluminum. You could take a freshly painted car (no wax) and a freshly polished Kirkham and expose them to fresh air and sunshine for 90 days (pick dry Arizona for ease). The Kirkham would show signs of minor oxidation while the freshly painted car would still have considerable luster. Just drive by any new car dealership with their usual 90+ days of inventory and you'll see where I'm going with this.

BTW, love the Kirkham cars but would probably paint mine for the reasons that others here have stated, i.e. brushed or polished, it takes some effort to keep those finishes top notch in the absence of a top clear coat. Don't bet against the Kirkhams to figure out a solution for this, too.