Black Roofs

How are people getting the roof of their cars black? So far I’ve only been able to do one of my cars but everything else has weird curves/lines that I’m having a hard time covering. I can’t seem to figure out what shapes to use other than square lol I really wish they gave us an option to CF the roof like we have with the hood

Stretching and/or rotating a circle is a useful shape to fit to a curved edge.