Spoke to Sealoflex again today. The guy I spoke to this time said the metal etch primer might not be necessary. Suggested doing a "pull test"- use the paint to glue a piece of drywall tape to a section, let it dry, and try to pull it off. It it pulls, you need the primer. Said the primer couldn't hurt though. But, I ordered the primer and it's on it's way.
Also the label on the Ceramiflex says 'not a substitute for final coat" The tech said Ceramiflex is part of a system for waterproofing. But if you are mainly looking for reflectivity you don't need the final coat.
He also said they don't sell much Ceramiflex. They sell more Reflectowhite.