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Okay now that you have decided to go with using the J.B. Weld here is something that I do in a situation like yours where the J.B. will be clinging to vertical / underside of a surface.
J.B. Weld has a tendency to sag and droop until it starts to set up. I mix up a small test batch and then 10 minutes after that I mix up the actual batch that I will be using to do the repair. Keep testing the first bit you mixed up and when it starts to set you know that you have 10 minutes of working time to get the second batch of J.B. into place. That way you won't have to fuss around too long keeping it where it needs to be.