I did a radio install here recently and after getting it all in place I decided to put something on the painted wood to better weatherproof it.
I got a little on the plastic in the center of the dash and was amazed to what happened.
The pic below is of the original install.
Notice how weathered and faded the dash looks next to the new pieces.
Now with a little light layer of Satin Poly.
When the weather gets a little warmer(Chicago) I am going to poly all the black plastic parts on the GC.
Figured I would just pass this on.