5D MKIII scratched

Black Sharpie?

Acetone won't hurt a "baked" finish, it evaporates very quickly and doesn't even have time to settle onto the existing finish very long.

if you goto a hobby Lobby get a 4 oz container of enamel in flat or matte. it comes with a dauber. get a q-tip soakin alcohol wipe scratch well then paint it on about three layers .works great!

Sell it and get a new one.

PICS?

I've used some automotive windshield pinchweld primer made by DOW. I believe its 5404G. Any "good" autoglass shop will have it.

Seriously, don't bother.

If you ignore that advice, then either use a black marker or some paint from the hobby shop carefully (minimally!) applied, or if it's a deep mark and you want to smooth it out again then there are a bunch of things you could try filling it with but I'd be very surprised if it didn't look worse afterwards as the texture of the surface would be difficult to match as would the colour.

http://www.testors.com​/products/573475

This stuff is supposedly very close to the gloss of the Canon black paint. You can get it at craft stores for under $2. I'd test on a small piece of metal first, something like a soup can lid. The smaller the brush the better the touch up.

Black finger nail polish.

Mike