I also doubt that anyone would cover stainless steel! what would be the point and it is way to expensive. And coating or anodizing is totally different from "cladding" there is no aluminum clad steel, regardles of "aluminization"? Anodization is a dying process. I think our big bumpers are polished and then coated with a sprayed on coating to keep the shine.
This has gotta be the longest thread with very little practical substance, but interesting none the less. Might as well add to the "misinformation"...
There is aluminum, or "al-you-min-eeyum" as some say, that is "Clad" in stainless steel.....but it is only good for cooking..
My vote on the bumpers....All aluminum, polished, then anodized to preserve the finish.
If you cover them in some of that silicone tire foam, it soaks in and they tend to brighten up a little. Still hazey, but a little shinier.