GunMetal Foil?

[slusher]

If you don't burnish the black foil too hard it works great. Hard burnishing results in the black coming off. A black marker works great also on silver foil...

[JollySipper]

You guys think it's possible to take the black chrome while it's still on the sheet and polish it down until it would pass as a gray color?

[Snake45]

You guys think it's possible to take the black chrome while it's still on the sheet and polish it down until it would pass as a gray color?

Uh, no. And I don't see why you'd want to. I don't think I've ever seen gray trim on a car.

But if you really want gray, why not just paint it? The hobby shop paint racks are full of gray paints, any shade you can imagine, in the military colors lines. And all the Model Master Grays brush well and are easy to work with. I'd suggest FS 36118 Gunship Gray. I often use it for the spokes on mag wheels and it's lovely stuff to work with. If you want a metallic gray, Testor has a metallic Steel in the line. It's also very easy to work with. It's lighter/silverer than my beloved old Pactra Steel (it's not too much darker than their Aluminum), but you should be able to darken it with a little flat black or dark gray--I've been meaning to mix up a bottle of such myself.

[The70judgeman]

Like Tom was saying about the Testors Gunmetal Metalizer paint...you could mask-off the moldings, paint on the metalizer, and then lightly buff-out the paint. You should be able to get the finish you're looking for.

[Mike_G]

Black Sharpie over BMF can give a purple tint, rather than the black you are looking for.

Testors makes "gunmetal" as part of their metalizers. It's very dark and I use it mainly on suspension parts to give different assemblies that are dark colors a slightly different appearance.

you beat me to it

I use gunmetal metalizer for leaf springs- it provides a great contrast