I just received an oxalic acid vaporizer from Heilyser Tech. in Canada.
I'll be trying it out within a week.  This model uses an air mattress pump
to deliver vapor, rather than directly heating in the hive.  Heat source is
a torch.  Looks very simple to use - the manufacturer insists on about 2-3
minutes per hive, with no risk of heat damage within hive, eliminating the
need for extra hardware for polystyrene hives.  I'll provide pics and
observations after I try it.


Todd.