Paul,
 
I was in contact with a rep. from I believe, Amvet Pharm. that mentioned a
product that they were testing.  It basically was a gelled form of Formic
Acid that was encased in plastic pouches with lasered holes in the plastic.
 The idea being a controlled release of Formic vapors over an extended period
and a much safer application method.  They are a Canadian company and I was
curious if you had heard of any results from them.
 
Brian Tassey
Alta Apiaries
Atwater, CA 95301