Corrosion from Reclaimed Water


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Q. Can you please tell me if powder coated aluminum can hold up to reclaimed water? We use reclaimed water here in Florida for lawn irrigation and I need to know if this will hold up for mailbox post application. K.W.


A. Yes, it can hold up but there are some important qualifications. You will need a good aluminum conversion coating to create a surface that is conducive to good bonding of the coating. You will need an epoxy primer coat to provide good chemical resistance and provide good edge coverage. You will need a chemically resistant topcoat that has good UV protection. The combination of primer and topcoat should be between 3 and 6 mils. If you do it correctly it will hold up very well.