vectran
Hey, Fuzz I found this old thread where you ask about Vectran versus Spectra/dynema.
I design new technologies for sails, and this kind of fibers lay all around my desk.
Vectran is about as thought you can get, excepting for the wet abrasion resistance about 4-7% lower than the one of Spectra/dynema (more if is not the special marine Vectran). If you have the $$$, Vectran is over all the best think out there, and his creep resistance (variation of his textile resistance under repetitive loads) make a real interesting choice for big running fish. Is more rigid than spectra and on many aspects easier to handle.
Or top cruising (long lasting for a outstanding performance) sails are made with Vectran.
More info can be get from the web, or I can send a PDF by email with all the engineering Bla...Bla... to anyone like this stuff.
Don't throw your Spectra away: is an outstanding fiber that will do most of what a spearo will never need.
For the good news is something stronger: PBO (poly p-phenylene-2,6-bezobisoxazole), or under his commercial name: Zylon.
PBO is the strongest fiber your bucks (and a lot of them) can buy... Your best shooting line! well... for a little while because he degrades over time under our normal spearo conditions and sunlight.
For any of those non covered ropes, the results are better if you apply an urethane/sunblock base coating. He make ropes with out cover behave more like an mono by adding some kind of plastic coating to the fibers.