Concerning water in the bottom of polynucs, about 35 years ago when experimenting with polystyrene chilibins (picnic-type boxes for keeping food - and beer -cool on hot days) as nest sites for bumble bees, we had the same problem. The lids were press-in, much like a lid on a can of paint, and were so tight that they looked as if they should have been rain-proof. However, when placed in a domestic shower for 5-10 minutes, water accumulated inside to an inch or more. It appeared that despite the apparently tight fit of the lid, water was somehow getting through between the lid and the upper edge of the box. We surmised that water may have been pulled in by surface tension. The answer was to fit a lid that overlapped around the edges, just like conventional hive lids.  

Regards,
Barry Donovan,
New Zealand.





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