When painting with a spray can I suggest painting with a spray-can gun (shown in picture) its about 2 bucks and it keeps your hands /fingers clean; plus! its keeps you from getting finger cramps. Like I mentioned before for plastic you will need to go over it with the Plastic Primer so the paint actually stays on. Let it dry and then go over it with the color you chose. As for the other parts (non-plastic) all you have to do it paint and let it dry!

