Just bringing this thread back to the top to see if it will draw any more responses. I have always liked the matt finish but never did a whole car in it. I will repeat a story I have often told. I had a Chevy Blazer with a stock fiberglass roof. It had a rough textured flat finish on the roof. After 10 years or so, the finish started to peel. I sanded it smooth and bought an acrylic enamel and added a flattening agent to it. After several months of letting it cure, I washed and waxed it. Satin finish went shinny. Within a day, it was back to its "satin gloss". I could wash the heck out of that roof, wax it and every time it would shine. Then within 24 hours, it would return back to its satin shine. That went on for several years until I sold it. Whatever combination of product I used, it always returned back to satin after waxing.