When I reworked my 311, I wanted to move away from the segmented aluminum rub rail.
Found a supplier called Barbour Plastics, Inc. (p o box 2158, Brockton, MA 02305 - 508-583-8200) that sold and shipped me a 100-foot long section of white vinyl rub rail. The price was very affordable.
This is now screwed into my hull to deck joint every 6 inches, and looks great.
Installation tip - once the first two screws are in place and firmly anchored, put the rub rail material under tension to keep it laying smooth and tight to the hull. I used a hand clamp and a come-a-long for this task.