I have had mud go soour that had been stored for a long period of time. I have never tried to use the soured mud, just bought some fresh to use. I do believe that the smell should go away after thourghly drying. I would also set the furnace fan to on for a day or 2 until the mud is dry and check for odor prior to priming and painting. If it still smells after drying, i would personally remove and apply fresh mud.
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