That's what I was afraid of.....well, depending on how much of a perfectionist you are. You can, and should, use some factory matched touchup paint to at least fill this in as soon as possible. Automotivetouchup.com is a great resource for touchup paint, whether in a pen, bottle or spray can. Being that this is a light colored metallic paint it's going to be a bit tricky to exactly match the appearance of the flake particles, but at least you'll dramatically minimize the appearance of the damage. I'd go slow and add multiple really thin layers to build this up a bit. On a flat area you could then let the paint dry, lightly sand it down with 3000 grit and buff it out - I've done this with non metallic paints and you can't tell that a repair was ever done. Metallic changes things, and the fact that this is on a panel edge really complicates things. The thinnest paint on a car is on the panel edges because the paint tends to flow away from it while curing. This is part of the reason we always have to be careful with panel edges when rotary polishing paint, and it's why we tape off these areas before doing so. So sanding on the edge becomes very problematic and, quite frankly, I would advise against it unless you've already got a pretty high skill set for that sort of thing. I've wet sanded plenty of cars, and machine polished classic cars worth millions of dollars, and I don't like sanding edges at all!