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Old 08-10-2017, 04:15 AM
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I would like to add that acid treatment is not best for any area that shows. New metal is always a better choice in those cases, but one must also consider corrosion protection on the back side. Like in your roof thread. I don't care what or how you decide to handle the spots where acid treatment might apply, but have myself had the best luck using those products with a scuff pad on a DA sander along with some blast media and wiping off the product while wet, and repeating the process several times before finishing with 80 grit. I don't have any way to know how long those places last, but 5 years is as long as any paint I know of is guaranteed to last over clean metal.
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