Seriously, have some JB Weld onboard. Great stuff. We have a fiberglass tape-reinforced JB Weld repaired pipe nipple on our exhaust system that has now gone halfway around the world. It started as a temporary repair and just seemed so secure that we left it alone even though we have the spare part onboard.
Finished the circumnavigation in early February in Grenada. Have to work on a book project for the next several months so the boat will be waiting for next year.