Quote:
Originally Posted by bird
The white stuff might be light surface corrosion, or deposits from getting wet. nothing to worry about, can't really see it that good in pic. If it is, check to see what the inside looks like? Is it shiny or the same white look. The outside can be cleaned up now or later with a little scotch brite and some elbow grease. Don't over rub it at this point. You don't want to remove too much of the clad coating. Later on in the build, you are planning on painting, so it will be treated and really cleaned with some prekote or some other etching so I wouldn't worry too much about it now. BTW, what kind of environment has it been in? Humid? By the ocean? Dry climate?
bird
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I agree. That is not dirt, but corrosion. The dirt sits on the surface, absorbs the moisture and the corrosion sets in. What has happened given the time frame is what I would expect. Having seen this a lot I never leave aluminium sitting around like that. Cover it up and keep it clean or prime it right there and then.
If this was my project, before doing anything much I would deal to the corrosion and prime it.
Andrew.
Have fun building and check on here a lot. 
if you are going to paint later. Just leave it clean and maybe spray some LPS 2 or something like that on it and wipe off. Use no silicones....paint does not like them and they stay forever.
Light solution of Alumiprep!
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