How do I cut a metal foam core door?

Li Do
by Li Do

Currently installed is a single exterior metal foam core door with a sidelight. I bought a 2nd exterior metal foam core door (door only) that I would like to cut down to width to replace the current sidelight. The result would be a door and side having matching panels.Once I cut the 2nd door to width there will be insulation or rigid foam exposed. Any ideas how to cover the open sides so it is not exposed? We live in a rain/snow climate and would like to securely close the sides before installing the piece where the sidelight was (for extra protection from the elements seeping in).Thx All!

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