I transport my kayak on car roof racks with strong tie-downs. To make it more secure, I also use bow and stern lines. Right now I’m using 5/32" (3.9 mm) nylon paracord (safe working load: 110 lbs), which works well most of the time. However, when it gets wet, e.g. by rains, the lines can get loose. Any recommendations for the materials of bow and stern lines with similar sizes (not too much thicker), which can work well in both dry and wet conditions?