Hello
surfing on the net I found that polypropilen should be perfect for fly lines and furled leaders. It is a lot lighter that water (0,9) and perfectly water resistant. I tried it making furled leaders and it floats perfectly without any treatment!
It is very cheap (a very gentle producer donated me thousands of meters who should cost less that 10 euros).
It has about the same elasticity of nylon, then to make furled leaders with small tippet is a lot more useful that rigid materials.
It is soft and hasn't memory.
The "natural" color is white and I think it's perfect for a fly line.
The minus is that it is more delicate that dyneema or other: in my experiments I broken some strands using it. No problem because my furled leaders was useful without problems.
And actually I didn't find products with more that 2 strands: to use it like line at least it should be 8 strands, minimum 4 strands. Then or I buy or make a machine to make 8 strands products...or must wait that fishing or other industry discover it...
But anyway to make furled leaders it can be a very good alternative.

I'm going to the hardware store, right now! Flyline is not cheap. Thanks, for the idea.

Bruce

Ps. Isn't dental floss polypropylene?

Bruce,

While you're at the hardware store you might do well to keep your eyes open for masons' line, the kind that bricklayers and such use for their dry-lines. As i recall it is a twisted nylon line. The first time buying the twisted nylon line that I now use as fly line, I was actually getting it to use as a dry-line while building my house. Since nylon has a higher specific gravity than PP it requires some treatment in order for it to float. On the other hand, that also makes it heavier in relation to its diameter, which may be an intersting quality. Good luck!

thanks PampasPete
I think that polypropilen doesn't need any treatment because it's lighter that water. I used it with no treatment and it floats very well, but only to make leaders. Did you ever triy lines in dyneema or silk? They are both more soft that usual lines and I tend to overweight a little to have more power. 54 grains is really very light. The softness can be seen like an advantage or disadvantage depending by your fishing style. A little like leaders: furled leaders are a lot more soft that nylon leaders, in a way more "weaks", but very useful in particular situations.

You are welcome. Thanks to you to share your experiences.
I think that anyway the better PP feature is it's weight and consequently that it doesn't need treatment. But in last times I returned prefer the dyneema: cheap, easy to find in different measures and more smooth and uniform. It's more heavy that PP but anyway lighter that water. I use it treating it with only vaseline oil and I find it very easy to use.