Anodizing for horns

Has anyone ever toyed with getting an Airchime or a Leslie anodized?
I was talking to a bloke today who said he wouldn’t touch the stuff because it’s cast alloy - something about too much magnesium in the alloy.

I’m no expert, but I wouldn’t take his word for it.
You can anodize magnesium, titanium, etc…
Ask somebody from the company who would do the work.