When doing acetic acid fumigation on a stack of hive
bodies with comb, is it sufficient to stack on a
board and use a spacer and normal cover on top
or do we have to duct tape the cracks between hive bodies?

Regarding drenching bees that do not take from a feeder,
it seems plausible that drenching gets the medication to 
younger bees, bees that are not yet old enough to access 
a feeder.  

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