the wood may not be completely dried out (ie still a bit 'green') or it just could be in too wet an environment or you have alot of mold spores in the house, that just get into the wood even after you kill what is in the wood.

You can always dry the wood completely, then seal it..with a clear varnish, apply several coats, let throughtly dry and air out in a well ventilated area...outside is best. At least 24 hours or per final cure time as indicated on the varnish bottle you use (or urathane). This will prevent mold, help protect the wood form humidity and prevent waste getting into the wood. As long as it doesn't start to flack off, it shouldn't cause problems for your snakes either.
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PHLdyPayne

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