Thanks. So much for my good intentions.no, this just makes them stay broody. Put them into a wire cage with wire bottom so air passes through. It will take a few days then she will be cooled down and stop.
I found this article on broodiness that filled in the blanks for me
http://www.the-chicken-chick.com/2012/05/broody-breaker-when-hens-mood-to-hatch.html
Sorry if this is a repeat - I haven't read all 1732 pages of this thread.
Out I go now to set up my broody breaker - in the dark.