I've got even MORE Aluminum questions ...... ok just one

When I picked up my aluminum sheets, they were somewhat scratched. I picked throught a good percentage of the pile and every sheet had some kind of nick or ding or some small scratch on it. I didn't worry about it at the time because I figured: "Hey it's aluminum. We'll just polish it out."
I haven't started polishing it yet but I did go to a site that I found somewhere dealing with restoring an older Airstream. I cannot for the life of me, find that darn site. I should have bookmarked it but NOOOOOOOOO. Anywho, I definately remember it saying that unless the Airstream was an older model, like pre 1980 or something, it couldn't be polished because the aluminum was different. It went on to say that that the aluminum content in the siding used on the older Airstreams had the correct composition to be buffed and polished.
So my question is: "I've got brand new aluminum. Am I in trouble here? Will I be able to buff and polish this or am I stuck?"
Any help is very much appreciated.
I haven't started polishing it yet but I did go to a site that I found somewhere dealing with restoring an older Airstream. I cannot for the life of me, find that darn site. I should have bookmarked it but NOOOOOOOOO. Anywho, I definately remember it saying that unless the Airstream was an older model, like pre 1980 or something, it couldn't be polished because the aluminum was different. It went on to say that that the aluminum content in the siding used on the older Airstreams had the correct composition to be buffed and polished.
So my question is: "I've got brand new aluminum. Am I in trouble here? Will I be able to buff and polish this or am I stuck?"
Any help is very much appreciated.