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Old 10-06-2007, 09:29 AM   #1
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2016 30' Classic
2009 25' FB Flying Cloud
Dade City , Florida
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Aluminum Corrosion

In polishing our "69 Globetrotter, we have been able to removal the clearcoat with Removall and have started polishing with Nuvite F7. I still have, at about head height, around the camper a type of corrosion in the aluminum that looks like clearcoat but seems to be corrosion in the aluminum. I have tried mineral spirits, repeated applications of Removall, etc and will no relief. I have attached a picture and would appreciate anyone who could share information on this. Thank you.
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Old 10-06-2007, 10:22 AM   #2
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I believe it will take multiple passes of F7 (in some cases 10-12) to get through it. Mine looked the same and is the result of the failing clear coat. Sometimes little bits of clear coat are left but you'll know after attempting to polish.

Good luck!
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Old 10-06-2007, 10:30 AM   #3
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It could be acid dust deposition. What is commonly called acid rain is actually acid dust that is dragged out of the atmoshere during rainfall. It can also collect on exposed surfaces, especially if those surfaces are electostatically attractive to charged dust particles.

The acid dust will not do any harm as long as the surface is dry. However, if the upper surface is pointed toward the open sky, it will cool off at night due to radiative heat transfer. Then, the surface will condense water vapor, especially in climates like Maine. Now you have a thin layer of condensed water that turns very acidic due to the acid dust that has collected on the upper surfaces of your AS.

After years of this exposure, you will get the type of corrosion you have.

Of course this is just my theory and you should consider other explanations.
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