Marine-Tex
John, I do my Spring rudder repairs with Marine-Tex. I've done my share of bonehead things like hawling my H216 up at the ramp without pulling the rudder up. Marine-Tex handles like putty, hardens like steel, and is not affected by long exposure to water. I mix it up, let it get tacky and apply it with a wood tongue depressor. I then put plastic food wrap over the top of the affected area and mold it with my fingers. When it's molded the way I want it I let it dry and then take the plastic off. The last several years its turned out perfect; didn't even have to sand it. Good luck and happy sailing.