I think the link works, weird title ? so just in case It's...... Meguiars Vinyl, Rubber & Plastic Protectant: Restores Shine & Defends Against UV Damage, 16 oz.
I can say with some certainty that the original aluminum rub rail is no longer available. I substituted Taco product A11-0511, which may not be available either. What's needed is an extrusion capable of bridging the Ericson deck/hull flange.
Video update for the Ericson 381: Forum thread searches for "aluminum rub rail" go back many years and tell the story of Ericson as a yacht manufacturing company just out of business, then picked up by Pacific Seacraft, then with owners left...