"Hooked" wrote in message
...
What would you consider to float a fly better? Polyester yarn? Antron
yarn?
Or some other type of yarn?



None of them will float a fly intrinsically. The buoyancy properties of
yarn, even polypropylene and some others which are positively buoyant, are
still not enough to overcome the effects of surface tension, unless large
amounts are used. The normal amounts used on flies will not make much
difference at all to the floating properties of normal flies. The only
advantage is that waterproof yarns dry more quickly, ( or don´t actually get
wet to start with), and thus it is easier to refloat such a fly after it has
sunk.

TL
MC