[blazefast]

Nice writeup, but this seems like just a temp fix to me.

If the scratch is just in the clear coat, a rotary buffer and someone who knows what they're doing will take care of it, no problem.

However, if it extends into the color coat or primer, ideally, you'll want a repaint.
There is something you can do though, which involves applying tiny coats of either primer, color, or clear about once a day for a week or so, then using a rotary buffer to level the paint and clear so it is flush. It takes some patience, but the results are very good when done correctly. There's a writeup somewhere on the internets but I'm not sure where it is now