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Arbomambo--I have searched for "SWARMTrak" to find the build thread that you mentioned but the only hits I get are back to this thread. Can you provide a link or post more detail here?
You can always seal the paper-board with some organic-solvent-based primer, clear , varnish. or even paint. That will not cause warping and make it more-or-less waterproof for any additional painting/weathering using water-based paints.