I have a 5 gal. bucket of joint compound, bought this summer. I used about 10% of it on two small jobs in July and Sept (3-5 months ago), and the bucket has been stored in my basement. I opened it yesterday, and found fuzzy red mold growing all over it, with a good number of spots of black mold as well.
I've never had this happen before - sometimes I've had partial buckets stored for years, and it's still good when I'm ready to use it. And, I can't find any mention of this problem on this site or through any Google search either.
Has anyone else had this experience? Is there any way to prevent it? If I remove the mold, is it OK to use the rest of the bucket? Should I contact the manufacturer and ask them to compensate me for the bad batch?
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