Soft Lines introduces a mooring line that you can depend on. This water-resistant line won't rust, rot or mildew. And if you leave it in the water, it will float on the surface, so as not to get caught in the propeller. When you pull it in, just "snap" the rope and it will dry off instantly. The mooring lines ($6.35 to $37) come in two diameters and 17 colors.