Sketchup FBX Exports

Well I went ahead and tried the sketchup fbx exporter and found it worked well but I was expericencing a problem that has to do with the textures it would seem on the models. Certain parts appear to be "see-through and they are clear, even though on the model in sketchup there is no transpearency. I am curious as to if I should use a material instead of solid colors, where it appears to have the largest problems, and also it has difficulties on curved surfaces. If you know of any similar problems or solutions, please let me know.

Skecthup doesn't care about face normalnorientation. Look at your model in monochrome mode, and any 'blue' face, is facing away from you. You will have to flip this faces in sketch up prior to export. Look up reverse faces in the sketch up help