I bought 2 gallons of Optimum Compound II a couple of months ago and have only used about 1/2 a gal. I went to refill my bottles today and was surprised to see that the top of the compound had mold all over it. I have noticed that the past few weeks the compound I have in my bottles I store in my mobile van have been kind of liquidy when I go to use them but I just shake them up. I've only opened the gallon container about 2 or 3 times since I bought it so I was shocked to see all the mold. Is this a defective batch or what should I do with it now? Can it still be used or what....? This is my go to compound and I just sold 115 details on Living Social last week so I cannot be without it right now!