How to apply multiple diffuse materials in Godot

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:bust_in_silhouette: Asked By bkeys
:warning: Old Version Published before Godot 3 was released.

I am attempting to load a 3D model exported from Blender. The mesh exported just fine but the mesh uses multiple textures, and Godot seems to be lacking a consciousness of which areas are to be applied to the mesh. I used some simple colors to demonstrate this

So I apply image textures to it by clicking Material slot > Edit > Textures/Diffuse within the editor. And after the image texture is applied it looks like this:

So it textured the spoiler correctly but it is not applying to say the windshield because the texture for the windshield is in a different texture. There are multiple slots for materials but loading the other png files in them does not seem to do me much good. Here is a screenshot of what my editor looks like while I am doing this