I am making a new glare shield (dashboard) for an airplane.  My first pass at this using a mold and carbon fiber and kevlar (strong so you can grab hold of it to get in/out of the seat) resulted in a very shiny product that while being very pretty (carbon fiber look through clear gel coat) reflected the sun and sky onto the windshield.  What I need to do is make the surface as non-reflective as possible while still preserving the beauty of the carbon fiber material.  How can I do that?  

Well, I'm a bit pikey so I'd start with the rough side of a washing up sponge.