I'll add Alcoa Dura-Brights are not coated and I'll quote Alcoa below.
"Alcoa Dura-Bright® is a surface treatment not a coating, it won’t chip, crack, peel or corrode. And never needs polishing. No other manufacturer can offer you that."
"You can’t say that about coated wheels, which scratch, filiform corrode and discolor in commercial applications. Only Dura-Bright® wheels use a patented surface treatment that penetrates the aluminum and becomes an integral part of the wheel."
"And, they are the only wheels that come with a five-year limited warranty against defects in materials, workmanship and corrosion."
-Tom