I need your help identifying what material my mushroom panel is made of. It's from a DG-202. Given the age, I'm assuming it is painted fiberglass. But the black pigment runs deep - as if it is really carbon. I'm asking because I'm considering putting the GPS antenna puck under the panel. But if it is carbon, I need to mount it externally. I'm not sure if this is the stock mushroom panel.

https://www.flickr.com/photos/darlin...57660836834946

-ZP