i've cut kelp with 65#, 80#, 40#, and in my opinion, the cleanest fastest cuts are with my powerpro 50#.
this being said. i've used powerpro, izorline, tuffline, viciuos, spiderwire, stren, and even cheap china ebay stuff spectra.
my favorites are powerpro, vicious, and izorline.
ebay's 65# is thicker than pp65, but that comes as a partial positive side because it wont cut through your thumb so easily.
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