After reading this post, I decided to do it on my midnight blue 87 300E and wow, it looks A LOT better. It really makes the car look newer. I used a satin finish black that I have in the garage. It was for bbq and was high temp so I went for it. It looks like the plastic was originally black. I DID, however, buy some glossy black to experiment and it looked bad. It stood out too much and you could see the imperfections in the sunlight. With the matt black, it looked perfect. Also, I would use some primer spray just in case. I used two coats. It'll probably pay off in the long run. Just wanted to share =)