Lifetime supply of floatant, real cheap!

[redietz]

You need to be sure it is HYDROPHOBIC fumed silica. There are hydrophylic fumed silicas on the market. They will initially dry the fly, but the residue will absorb water. The stuff the OP mentioned is the real thing. I use a turkey baster to fill the small bottles.

Actually, FF is supposedly a mixture of both -- hydrophilic to dry your fly when it's already wet, and hydrophobic to keep it dry. The presence of the hydrophilic is why the directions on the FF bottle tell you to always apply with the brush, and to blow off the fly before using. Otherwise, the fly ends up as a soggy mess.