Greg,
If the aluminum surface is still smooth and shinny and the only visible change is coloration/staining, I don't think you will have any problems.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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