On Nov 9, 3:23�pm, Gene wrote:
On Mon, 9 Nov 2009 08:52:29 -0500, "mmc" wrote:
The second looks to be paint oxidation. I'd wax it and see how that works
out. Oxidation on bare aluminum will seal it with a white powder and won't
harm anything.

That is one of the most entirely incorrect things I have ever read.

Remove the paint with an appropriate stripper and aluminum wool (NOT
steel wool), alodine the affected area, prime with zinc chromate
primer, and paint with an appropriate paint.

The oxidation that protects aluminum is not visible. If you can see
corrosion, that is the beginning of "metal decay."

Probably more than you ever wanted to know, but......http://rgl.faa.gov/Regulatory_and_Gu...visoryCircular...
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Good call on the corrosion issue...if you can see it it isn't good!
Take care, as winter is coming...not that it amounts to much here in
S.Calif!
Mike