My boat, Norwegian Steam, also had a leaky portlight problem. I found a good solution for this several years ago. My portlights were made by Perko and I think that most of the Jasons have the same, because Earl Miller bought them in bulk and passed on some of the savings to the owners. In 2012 I purchased product 990063 from Defender.com, described as PKO Portlight Weatherstrip. I notice that they still sell the same product. It comes in 10' lengths. By the way, I am guessing it is time for me to buy another 10' from Defender. Thanks for the reminder.