You may want to look into Nyalic clear coat. It is no longer available directly from Nyalic, but they put me in touch with DoubleHorn Products, who sells it in 4 oz. spray cans under their own name (although I am assured by Nyalic that it IS their product). It is intended for all types of surfaces, including bare metal or plated surfaces. Supposedly, this stuff is the best.
I have not used it on the Camaro, but I just used it to clear coat the brake calipers and undercarriage/suspension components on a new car that I just bought. We'll see how it holds up to a New England winter.
I was worried that this clear coat would be too glossy, but it looks great. After coating the plated brake calipers on my new car (which have a slightly rough surface texture), you can't even tell they were coated. On the smooth aluminum diff cover, you can see a slight increase in gloss.