explain your problem(always explain even if you send an image)
#Different shades of polygons. Help me pls.
candid gust
assuming shading is the issue here? try clearing split normals
shade flat?
also you prolly shouldnt be importing models to use it is probably not ideal 
candid gust
did you clear split normals ?
under the vertex tab(idk the name but the green triangle in properties window)
right click and either shade flat or shade auto smooth it
candid gust
because its facing the light
warped wasp
