Nylon only...w/floats
The negatives for poly's are to numerous. I use Nylon three strand (5/8 for my 5000# boat). I splice in galvanized thimbles with a shackle for the 'sliders' and backspice or measure exactly for an eye on the boat end. I also place a small float, looks like a larger version of those you find on the top edge of small seines, in line before back splicing. The float helps keep the line up and easy to snag with a hook, but does not leave the rope so exposed to UV.No, at my type od bertn it is unnecessary to coil them up on the dock, and impossible to do on the outer pilings anyway.Remember this though, a dockline MUST have all the stretch possible to work properly, and nylon 3strand is a proven material for this. Even quiet lakeside docks have occasional storms, the powers that be suddenly decide to raise or lower, or some jackass puts his Scarab into the bathtub and creates 3 foot wakes. At those times it's either the dockline or the boats hardware that has to absorb the shock.g'Lik