Though urethane paint is very durable the surface to which it is applied largely determines which primer to use.
Paint roof with urethane primer.
Apply the sherwin williams paint and primer to a galvanized roof with a paintbrush or a roller specifically designed for corrugated metal.
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As with all primers proper surface preparation and weather conditions must be provided to ensure proper adhesion.
They are most commonly used for sprayed in place polyurethane foam insulation as well as other commercial roofing substrates including modified bitumen single ply epdm smooth gravel bur and concrete roof decks.
With a proper primer urethane paint can last for years.
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If crawling around on a metal roof in the hot sun does.
However for specialty applications like marine or automotive there are additional considerations.