Talk to Florida paints (I am assuming you will be going there to get matching paint), or if you already have paint go to that supplier and ask them for ideas why the paint is failing. They are the experts in their product and should be able to help. Also, as mentioned above you should check for moisture. Since this is our rainy season you might be better off to wait for a dry low humidity period for the repair.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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