I'm planning to make a skin pack which involves internet images on paint.net. If you download the file and look at the paint.net images, you'll see why it isn't working. It appears in the parts selector but doesn't make any difference to the car. Playing with the colour tab makes no difference either, What'm I doing wrong?
... you haven't setup your materials.cs file correctly for one thing. Maybe you haven't looked at these resources yet: http://wiki.beamng.com/Simple_skin_tutorial http://wiki.beamng.com/Introduction_to_skin_system From the folder titles you clearly understand that the vehicles have names such as "hatch" and "van" but your materials.cs does not reflect that at all.