Duplacolor, black. Yes, car wax does help to keep it shiny. White diamond metal polish, has a built in sealer also. Thing is, the rain water, or any water that gets on the aluminum tends to leave water spots. This turns into oxyadation in time. I think the water tends to stay on the banner, because of the way the air flows over the truck as you drive. Like I said, the new finish car wax does help. I use meguiars cleaner wax on my paint a lot. I also use old green turtle wax somewhat. But the new finish seams to work best on the tailgate banner.