I have a 2002 ZR2 and around the side window glass the body pannel is rusting. I am not sure what material the pannel is made of as it needs to be sanded and repainted. A magnet will not stick to it so it has me lost as to what it is made of. My fender flares are also begining to lose it's paint and I believe they are made of plastic. The roof rack also needs paint.

 

Are you talking about the plastic around the windows as discussed and shown in the thread below:
How To: Paint your rear window trim (2 door) with pics

 

Yes! That is exactly what I was asking about. Thanks for the thread location. I cant wait to try it.