There are reasons why paintwork can turn dull. Oxidized paintwork, or UV-damaged paintwork. Oxidized paintwork can look dull and looses its shine. It doesn’t turn pale or looses its color, this would be UV-damage, not oxidation.
When you have a matte wrap on your car, or just matte paintwork, you need to take care what protective product you are using. Protecting a matte finish is just as important as on a normal surface, but you need to be careful what you use.