I'm not Scott, but I do have some experience with the float properties of congo hair. In my experience, it does not float as well as foam (what does?), but it floats better than most synthetics. I think it is a polypro yarn, so it does not absorb water. I use some gel floatant on it and the only problem I have had is when a fish slimes the fly pretty badly and keeps it dunked for a while.

Ted