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Many epoxies will set up in moist or even wet conditions. Progressive epoxy sells a lo-vis epoxy that will set up on a glass of water. Probably West has a similar product. Progressive's wet/dry 700 epoxy putty can also be installed underwater and is much easier to work with. About half way between mayonnaise and peanut butter.

You will only need a small amount. I have half of my gallon kit in my basement. I would be happy to donate some to your repair. e-mail me if interested.