Though urethane paint is very durable the surface to which it is applied largely determines which primer to use.
Paint roof with urethane primer.
With a proper primer urethane paint can last for years.
Apply the sherwin williams paint and primer to a galvanized roof with a paintbrush or a roller specifically designed for corrugated metal.
Urethane roof coatings more commonly known as polyurethane roof coatings are among the strongest and most durable elastomeric coatings available in the industry.
For pricing and availability.
Black jack eterna kote 4 75 gallon silicone reflective roof coating lifetime warranty item 484330.
Black jack elasto kool 1000 5 gallon elastomeric reflective roof coating 10 year limited warranty item 139941.
However for specialty applications like marine or automotive there are additional considerations.
100 acrylic roof and wall primer sealer with crack penetration for leak prevention 27 piece model as210 25 view the lanco roof and surface prep.