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my understanding is they use some kind of dye stain afterwards but I'm with you - I don't know why it would be used in a bathroom
Advances in Fingerprint Technology by Henry C. Lee (google books):
talks about using in motor vehicles & small, enclosed spaces - which are not necessarily airtight
http://books.google.ca/books?id=duUJEp4WbQ8C&pg=PA117&lpg=PA117&dq=ester+cyanoacrylate+latent+prints&source=bl&ots=Hh9nWZe2MM&sig=YL4O0wVcu_znMBcxPF-08B-kRvc&hl=en&ei=crsdS5q2B8GplAffwsnyCQ&sa=X&oi=book_result&ct=result&resnum=10&ved=0CC8Q6AEwCQ#v=onepage&q=ester%20cyanoacrylate%20latent%20prints&f=false
also I discovered that some kind of flourescent powder can be used in addition to or instead of the dye stain