can't really tell how it would look but it looks shinier if that's waht you're going for, would have to see it in the dash with the receiver and the surroundings, thing is the gen5 surroundings aren't really shiny or anything they're all kind of bleh so this would really stand out I think but dunno
as for the paint and use as long as you don't scratch it with like keys or something sharp it will be good you just have to rememeber it's still paint so you have to be a little more careful than pure plastic. but other than that it should be fine since the interior doesnt really have heat extremes or anything so it shouldn't peal or anything I don't think

good job though painting is a pain in the ass i know that from experience heh