Sorry I don't really follow. To you mean while editing the 3D model or the image within the 3D model?
EDIT:
I get it now, found this video:
Yeah but you can't do all your car skin like this. As you see, Sonax logo is'nt straight, you do that on the FOM car, will be ugly because the sculpture of the sidepod is more important than this F2 car on the video