Oh yeah and the portlights that were just put in with silicone were not leaking at all. The one with 5200 had a very small leak that I never could find. The inner board was a little damp when I finally got it out. Not enough to cause any rot etc so it must not have been leaking long.
Interesting. Sometimes hull flexing and tortional influences will break the seals no matter what they’re made of. Good luck with your project.