Does anyone keep up with "Boatworks Today"? The guy has a good set of DIY videos on various topics. He recently did a couple on the strength of mechanical bond between Gelcoat and Epoxy. Here are the links.
I've been using his series on rebuilding a rudder. It has been quite an experience. He provides really good reference material. I kinda posted this to see if any debate pops up. It is always informative to hear many sides of these things.