[jmatta]

Not a Porsche, but someone hit hit my Jeep GC on the front flexible bumper cover and it looked really bad (of course, no note left). I first buffed it first with my Porter-Cable using various polishes and was surprised at how much came out. I then filled the big scrapes with touch up paint, slowly filling to match the other surfaces. A final wet sand and polishing makes the spots almost invisible.

If you are not comfortable with the process, the dealers know all the guys with the tricks, as mentioned earlier. If you are a PCA member, I'm sure some of the local concours guys could help you out.