Too bad know-it-alls can't do it all
It should not be difficult for an anodizing company to finish in the color you want. If you want to do it yourself this company's supplies may help.
http://www.caswellplating.com/catalo.../?cat=0&q=grey
Last edited by gwp; 02-10-2017 at 10:54.
Paint like Duracoat, et al will do it. Krylon, Testors, etc. make spray flat grey, as I recall. Downside is that you'll have to completely disassemble the thing first. You'd have to do that with any coating/plating method too.
Spelling and grammar count!