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Fluorocarbon as a leader only because it sinks faster and gets your bait down quicker and it's virtually invisible in water. Very high abrasion resistance as well. You don't use it as a main line because it is too dense and uncoils much too rapidly.
Because its coily,likes to unravel off the spool,stiff with no stretch.im not a fan of it for mainline.
Thanks Bob, Can you elaborate a bit more on the treatment of Silicone/Teflon on the line to keep ice from forming? I usually fish in an icehouse but would love to hear what others do to prevent this also.