assign material au a block of sketchup imported in revit.

[Andrea.Zuccher]

Good morning.
I'm sorry, it's the first message I've ever written in a discussion on a forum.
I have this kind of problem.
I have to create citroen car families, but for revit I have found nothing already ready.
I have seen that it is possible to create a family of revit and import sketchup machines, but I do not understand how I can assign the materials, if I follow the render the machine becomes gray.
I hope someone can help me.
Thank you 1000.

 

[Tristan]

Can you attach the skp file you're using?

 

[Andrea.Zuccher]

I tried, but the system doesn't allow me to attach a sketchup file.

It's a 3dwaterhouse file.
it is car citroen ds5, and in general sketch up elements, which I imported into a new family of revit.