yo do these have to be transperant paint? or can it be like gloss black or something like that ?
it doesnt have to be transparent. paint it the color you want and then use transparent (clearcoat) over the colored paint so that the job will look better for a longer time (just like your car's exterior).
transparent paints do help around the ac controls though, so it is a good idea to look into those unless you want the little pictures do disappear forever.