Case finish?

[XJkid]

I want to clean up my cases, but do not want to mess up the finish. Are these cases painted, or is it some kind of anodization?
I've read some old threads, but could not find a definitive.

[DiverRay]

Factory polished then clear coated some, rest is either paint or clear coat as well. That is why you see the yellowing on some of the parts. probably best to soda blast and clear coat to get another 35 years out of them. You would want the high temp clear, though.

[TADracer]

Ditto above. Eastwood makes an oem style finish for this called Nyalac. Comes in rattle cans and works well. Does yellow after 10+years though.