Painting package tray - need advice

I'm putting together a stock pattern interior in non-stock colors for my current project. I want the package tray board to be dark grey or charcoal. It's a color Mopar never used in that location. Given what the material is and that it sits in the sun underneath the back window, what kind of paint can I use to change the color? Please confine answers to something that I can get in a rattle can...

Thanks for your help