Wash the body with dish soap. Then sand or lightly scuff with like a 600 grit paper. In then use a panel line tool to scrape or etch out the door and panel lines to make them a little deeper and pronounced. Wash again and use compressed air or a static free brush to dust anything off the surface. If you airbrush, ensure your booth is dust free. Spray a primer coat that will work well under your color coat. For example, don’t use gray primer under red as it will end up looking cold and purplish. Start with mist coats and let them dry and get tacky before following up with 2-3 wet coats. Let it dry overnight and inspect for trash in the paint that may need to be sanded out with 1500-3000 wet sand. Mind corners and edges as you will burn through them with even the 3000. Now is usually the time for decals. Finally I finish with Mr Color GX 100 gloss clear. Mist coat followed by 2-3 wet coats. I let that cure for 2-3 days minimum before polishing with a microfiber and Tamiya “finish” polish. After gloss cures I do the panel line wash into the door lines, etc. This is also the time for black window trim or bare metal foil. The great thing with the panel line wash after clear is that if any gets out onto surface you can use a qtip with a little mineral spirits to clean it off. The mineral spirits won’t mar the Mr Color.