A few years ago I was in a sort of similar position. I brought my boat to the dock to load with gear before we left on a week vacation. At the dock I opened a lazarette to get the water hose and I smelled exhaust gas in the engine compartment. Long story short, the exhaust riser has rotted out. I could not get a replacement in time to start the trip. So I made a short trip to an automotive repair place and bought a few supplies. JB Weld and some metal braces worked and allowed me to run the engine for about 20 hours on that trip, including trips up and down the NY East River, both with and against the tide.
But, as soon as I got back to my home port I had a new part installed.
It's up to you, but I would change out the temp repair as soon as it is convenient to do so. You don't want to be out at sea trying to fix the fix.
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY
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