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Ok, so I take a model in Sketchup, export it as Collada .dae file, and import that into Blender. The model is a solid, white on the outside, and red on the inside so I can tell which face I am looking at.

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It imports into Blender like this:

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As you can see, all the normals appear to have been reversed. Through much research and experimentation, I figured out to clean up the model, I select each part, edit it, remove duplicate vertices.

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Which seems to fix it, except, problem is, I seem to be getting some faces that it chose the improperly flipped version of the face when it removed the duplicates.

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As you can see, the normals for that item are flipped as the lighting is backwards. Normalizing the ... normals does this:

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Any idea how I can fix this? Or is the only solution to make sure the inside and outside of every face is the same color?

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