It was "sealed" in 1984 before I bought the house. No one remembers what it was sealed with. It does NOT leak, but it is rusting.
I figure I'll be sanding off rust and rolling on a sealer coat of __________?
Any suggestions? Going to Lowes is just confusing. Fiber or non-fiber, silver or white, solvent or water clean-up, SCAQMD Compliant or not. Everyone else I know has asphalt shingle roofs so no experience there.