need help

i am making a skin for the RRI 50ft Boxcar and is all i can make, How do i make the skin work?

 

I think you're in the wrong subforum. Mod creation is what you're looking for, one level higher. This one is meant exclusively for programming help.

Out of curiosity, what does your materials file look like? I might've run into this issue before.

 

They are completely fine, all boxes filled out with color