dfly,

I make mine from the following material:

Coats & Clark transparent nylon - it comes in clear and smoke plus in 2 diameters of .004 and .005

Berkley Vanish in color green and 4 pound test

Cabela's clear fluorocarbon in 4 pound test

6/0 tying thread

Kevlar tying thread

Kevlar, Cabela's fluorocarbon, Berkley Vanish and Coats & Clark nylon will all sink and make good wet fly, nymphs and streamer furled leaders. The Coats & Clark transparent nylon makes a very small in diameter furled leader that (in my opinion without testing) I think would float if a floatant was applied to it.

6/0 tying thread will float after being treated with floatant

All of the above materials make very good furled leaders and they all have there place in fly fishing depending on your style of fishing.

Have fun!!

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Warren