[Ginola]

Ive dealt with this, I had to sand down, wire brush, treat and re-paint under the spoiler,

You should if your re-fitting replace the rubber/foam dust lip round the spoiler before re-fit + I personally silicon sealed around bolt holes/fittings points.

I DIY'd the paint with primer/paint/lacquer (cans) took a while but easy enough and you can get a bloody good finish if your patient, (not that anyone see's it under the spoiler). hopefully yours isn't too bad.