Hej på dej!!
Join Date: Apr 2004
Location: Utah, USA
Bikes: Ritchey Road Logic, Della Santa Corsa Speciale, Renn DeWitt Custom, da Vinci Joint Venture, Ritchey Comp All-Rounder, Rivendell A. Homer Hilsen, Crescent Professional
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Years ago, 14 to be exact, I ran into a similar problem with a set of Dura Ace cranks. The left crank got scuffed up in a wreck; instead of purchasing a new arm, I decided to polish out the abrasions. If that looked too bad, I'd buy a left arm and be no worse for the attempt. As it turns out, the Dura Ace also had some kind of clear-coat...not paint...over the aluminum. We polished right through it and after some effort, the dings in the arm looked pretty good. With the two arms side-by-side, I could see that the polished left arm was slightly more lusterous and "brighter" than the original right arm and spider. However, once mounted on the bike, where you can't see both crank faces at the same time, you never notice. I was worried that the clear protectant missing from the left arm would cause it to tarnish over time.
Years went by and I forgot all about the two dissimilarly finished cranks until I read this thread.
Well, it's been 14 years as I mentioned, and tens of thousands of miles later, and the cranks both look just the same as they did after the touch-up work.
So...I'd say go for it.
However, I live in very dry Utah, USA(merica), not humid USA(frica)...therefore your milage may vary.