I have used SEM color coat professionally for years. Very durable and does not change the sheen of the plastic, and will work on many different types of plastics/urethanes.... And there are tons of colors. And you can buy it all over the internet.
Another quality product is called Color Bond. Again, many colors and does not change the sheen of the plastics. I believe LMC truck sells it, or just google either product.
Take your time and degrease ANY panel to be coated with alcohol or acetone, or wax and grease remover before coating. Both products will last years, plus help to protect the plastic from UV damage. I do a minimum of 2 coats. Usually I do 3 if I’m changing the color of the part.
Finally, almost any store that mixes auto paint should also be able to mix factory matching trim paint for your paint gun if you are changing the color of an entire interior.
I would only use Krylon Fusion for arts and crafts, if you can help it.