Do I have to coat pepakura foam Halo armor in anything?

I'm attempting the process of making a full suit of Halo armor, using the pepakura foam method. The armor will be made out of foam tiles. I was wondering, when I'm done gluing the foam templates together, do I have to coat it in anything like Bondo or fiberglass resin? Or can I just leave it plain foam and paint it how it is?

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