No Detail on materials

I am making things in Blender and importing them in to Unity as .obj. Before applying materials was no problem, I would make one and attach it to the right parts of the structure. But now no detail appears on the objects. It is just a solid colour. Does anyone know what is going on?

Looks like the UV map for the Model is missing.
Without a proper uv map unity can not draw the textures on the materials like you have it to be.

Thanks a lot, it is displaying now.