Painting the interior of the hard top and having it last is a bit more complicated than you think. The hard top is molded, so there is residual mold release agent. Add to that other contaminants, oil from touching... and you have a layer of paint unfriendly stuff. The first thing before painting is to prep the surface. a good wash soap and water, and rinse well to remove residual soap. Then wash with trisodium phosphate (not the fake stuff, true TSP). it is one of the best degreasers out there. Wear gloves and goggles, and avoid getting it on you, it is not toxic, just can irritate skin. Rinse well and the best bet is to add an plastic adhesion primer. They sell it in rattle cans at auto supply places. make sure to mask everything you do not want to paint very well, spray paint has a way of getting on everything.Then paint with whatever paint you like. Just be aware that a white hardtop makes it brighter inside the jeep, and a black interior will really make it much darker. If you do decide to paint it black, brighter interior LEDS are necessary.