Don't know if I can be of any use.....
We have a company that provides my company with specialist finishes such as Powdercoat and anodising
Anodising "could" be useful for items such as fuel filler caps in colours such as silver, red, blue, black, yellow etc. Will prevent further outbreaks of corrosion.
And Powdercoat for the "B" pillars for example which are starting to look a bit tired after all these years.
The items we use them for which are a mixture of aluminium, mild steel and stainless steel - the finish they produce is factory perfect.
Was wondering if anyone would be interested in this?