Apply the sherwin williams paint and primer to a galvanized roof with a paintbrush or a roller specifically designed for corrugated metal.
Paint roof with urethane primer.
Though urethane paint is very durable the surface to which it is applied largely determines which primer to use.
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.
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However for specialty applications like marine or automotive there are additional considerations.
With a proper primer urethane paint can last for years.
Urethane roof coatings more commonly known as polyurethane roof coatings are among the strongest and most durable elastomeric coatings available in the industry.
As with all primers proper surface preparation and weather conditions must be provided to ensure proper adhesion.