Originally Posted by got polish
The skin on a AS is so thin I would have to say it is through clad but I've herd it may not be. I have polished lots of them but none as bad as Jim Wagmins he had it parked 200 yards from a San Diego beach in a pop up car port for something like 10 years. Well thats a sweat box with dash of salt. Yep it did quit a # to the top & about 1/3 down. I should have took pic but after getting in to this job I just wanted to get it done & put it under the never again list. My point is I used 150 girt (yep 150) on the top & then worked my to 600, a 45 DI grinder with VF SV wheels to get around the rivets. I'm sure the alloy is 1/3 thiner on top. But it shined up very nice & still looks good to day.
Alclad is like a sandwich, if you wish.
The bread is pure aluminum, and the beef, is the tough stuff, the strength.
It's doubtful that you can polish away .005 of the alclad.