I've got a 98 Headwaters hypalon boat with some urethane coating on the bottom and sides. during my last cleaning and 303 session with it I found a small pinhole on the bottom of a tube. trouble is that this tiny hole is on the edge of a wear spot in the urethane coating, basically one side of the patch will be on hypalon and the other on the urethane. Does anybody have experience with this? Do I need any special glues or will shore adhesive work just as well on the urethans as the hypalon?