From what I've seen with these wheels, the deterioration seems minimal when kept garaged and in mild climates. I do not plan to polish the rims and the rest of the wheel will have the Dow 7 chromate coating on it. I'm not a big fan of the polished look on magnesium wheels, but I won't say "never." Also, there's a product marketed under the name of Gibb's brand which appears like an
oil, but supposedly isn't and keeps the magnesium wheels in near perfect shape.