I've read in the past that joint compound if frozen must thaw and then can be remixed. However today I was reading on diychatroom and I came across a thread in which a poster speculated that some bad joint compound may be that way because it was frozen at one point. Here's the post:
Can some experts here please weigh in on how big a deal it is if your joint compound freezes? Is it worthless? Does anyone have any real life examples? Also what's this I've been reading about weird smells? Does joint compound really go sour like milk?Sounds like the mud was frozen at some point, perhaps in shipping from the plant to the store. You say you're in Southern California, but no telling where the mud was trucked in from. Once mud freezes and separates, no amount of mixing will make it usable again....