I picked up a bottle of Permethrin at our REI Members garage sale today. It was reduced 66% because the bottle didn't have a sprayer! Anyway, I seem to remember reading once that in addition to using it to treat clothes, you could use it on a hammock to prevent the wee beasties from having a "southside" feast. Is this true? If so any thing to be cautious of? Seems pretty easy, just set up hammock, spray, and let dry a few hours.