Originally Posted by
Sammyboy
This is because, I believe, it can't be done. It's an electro deposition technique, and depends on the material conducting the right way. Aluminium is much less conductive than steel.
It most certainly can be done. Look at the instrument panel on a 64-66 mustang... chromed plastic! "Vacuum Plating", common in 60's and 70's era american cars.