The roof is plastic/fiberglass. So just scuff and clean. I rattle canned my 82 four years ago with some ACE fast dry paint. Flaked off in a few months. Ended up taking it off, hitting with 80 grit and then cleaning up with paint thinner. Wiped it down, hit with primer, and shot with HF el cheapo gun. Stayed perfect for last two years. I choose the textured finish like stock. I think some have gone with smooth. Depends on your taste.