Cars - PORSCHE #70 PORSCHE MOTORSPORT 935 - 4 main problems about paint / livery design

1-Unpaintable windshield banner.
2-If you make the covers of the stock rims paint as a carbon, they disappear.
3-Unpaintable full of rear bumper.
4-The pattern of the rear bumper diffuser looks bad because it matches the top paint/design of the car.