Hi, I recently acquired a hardtop for my LJ and am planning to paint it with SEM black trim paint. I searched through the forum on this topic and got some great prep advice. I'm not sure what sort of trauma this top experienced but there are several spots that are worn down through the original paint. I'm wondering how I should address these damaged areas before painting. Primer just on the damaged spots? Primer the whole top before painting? Any advice or past experiences appreciated. Thanks