Coating on Voyager bezels?

[tppytel]

I picked up a very nice 11C recently... cosmetically perfect apart from something that looks like very light "water spotting" in one spot on the bezel. I doubt I could capture it in a photo if I tried - it's not noticeable in normal use - but it's definitely "in" the finish somehow and not on top of it. I read somewhere - possibly incorrectly - that the Voyager bezels were not simple brushed aluminum/steel but had some kind of coating on top? I'm wondering if I could apply a very thin coat of matte (or satin) acrylic varnish (like I use for gaming minis) to the spots and then buff it out with a soft cloth to minimize the spotting, which honestly isn't very apparent anyway. Any advice/experience here? I can absolutely live with it as is, but I figure that a little acrylic varnish *probably* won't do any permanent damage and could be removed cleanly if it doesn't work out. This 11C is so perfect otherwise... I'd love to make it even more perfect.