It really is unlikely that paint with out undercoating will bond perfectly to aged metal. I like to recommend power-washing, sandblasting, then undercoating or priming before seeking to re-paint as a way to avoid peeling and separation of The brand new paint layer when it is dry. When considering criticism http://manuelcsakt.blogproducer.com/80285/denver-commercial-roofing-things-to-know-before-you-buy