Seems like a favourite subject on here
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Peter
Flourocarbon is a different polymer - polyvinylidene flouride. I've used quite a few fluorocarbons. Knotting is an issue, you need to modify knots and test carefully. Linking fluorocarbon to nylon or copolymer can cause problems. Leader rings are the best way.
The advantages of flurocarbons - its more difficult to see it in water, its stiff and it sinks.
The disavantages - knots, stiffness, ecological. (I suspect some is brittle, ie shatters when whacked - unlike more elastic monos.)
I find myself coming back to flurocarbon when I need a confidence booster. In Canada, fishing for Kings, bruising fish, I used flurocarbon and broke a lot - not just on fish. Switched to (gulp!) Maxima and landed fish!
Saltwater fishing - used nylon tapers and they broke, switched to flurocabon and landed fish. My theory is the nylon was getting sunburn, flurocarbon is unaffected by UV.
There is a place for flurocarbon it can be useful but its hardly vital. It amazes me we ever caught fish on brown Maxima - fish are so much brighter and spookier now
Christ, next thing you know well need 3-weights to catch rainbows. Whatever happened to the 7- and 8-weights we used when I started?
More seriously - I'd advise anyone to taper their leaders. I'd also suggest that in the UK we talk about breaking strain too much - diameter is more important. Try getting clean turnover when you step from 6lb down to a 4lb tippet - when the 4lb tippet is thicker than the 6lb.
Magnus