I would try some of the floatant for dry flies. One other thing I have done, that may not be an option for you, is to kill a duck and then find the gland (I can't remember the name of it) that holds the oil they use to coat their feathers. Break the gland in a small glass jar and then strain it. This stuff works forever. I have flies that I coated years ago and have not needed to apply floatant since.