You don't need to worry about the paint (whether it's dull, semi gloss, etc...). It will all look very nice and shiny as long as you paint the back of the plexi and not the front. I did this for my cab and it turned out really nice. I set the plexi in the cab how I would ultimately like it placed, and I then masked off the tv screen portion and the IR port from the tv (on the front of the plexi). I then took out the plexi and masked the other side of the plexi glass following the taped off parts on the other side. I then laid out some newspaper, and sprayed it with the cheapest black spray paint I could find. After it dried I just pealed off all of the tape, stuck a little velcro on the top and bottom corners of the TV and Plexi and then stuck it in place. It looks really sharp in there. It hids the TV casing really well, and the little IR slot is still uncovered so I can turn the tv on and off with the remote. It really makes a huge difference.