Hi Y'all, We have visible heating ducts in our downstairs(walkout basement) Family Room. They are galvanized sheet metal.And they are flat, level with the ceiling. Can I give them a coat of KILZ Latex Primer, and then paint over them with Interior wall paint? Or, is there more preparation I need to do first? It'd make the room a lot nicer looking If I could paint them. They wouldn't stick out like a sore thumb. Thanks for any help or Suggestions. It's appreciated.