Aluminum Sheet Discoloration

Been on 'layoff' from building due to job issues, marital issues...etc.  Trying to get back going.  I"m building from plans only.  My aluminum sheets have been in storage for about 5 years.  They have gotten moisture between them.  They are discolored.  It's not a powdery substance on them.  Just looks like discoloration to me.  Are these sheets still good to use or will I need to buy more?

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Permalink Reply by Joe Harrington on February 2, 2013 at 12:16am

We had the same thing happen to our aluminum sheet from storing them in an area with high condensation. Not a problem. I even decided to polish my airplane and was able to polish those areas by first going over it with maroon scotchbrite wetted with polish (Nuvite F9) and a random orbit sander. That tells me that the corrosion (it is corrosion) is not very deep. I would carry on without worry if it was me.

Permalink Reply by Steven Ward on February 4, 2013 at 12:20pm
Oh yea, I've had some of those life issues to lately, it's put me way behind to! Joe has it right, "sand" it off and keep going.

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