When i put the models into unity the decal disappears why?

Unity Engine
1

After i made this in Google sketchup 8 pro

this is what happens when i put it in unity

do you see the paint comes off in unity how do i fix that?

2

Decals + Textures are very different things. How did you texture the models in Sketchup? Did you create any UVs?

3

no i found the box decals on Google images and then i just added a image to the paint and thats it.