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The existing materials may be an issue for adhesion of apaint or a new coating. My suggestion would be to skip paint and opt for a proper roof coating like maybe something like ER Systems Acrylic. It's very commonly used to coat panelized metal roofing.

What ever product you decide to use you can try a series of pull tests to see if the paint or coating will adhere to the existing. I would highly recommend a power wash first to remove any loose granuals or chalked primer.
 
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