Instruct: Classify Amazon reviews into positive or negative sentiment
Query: For Black Shatter

I purchased this item on in the middle of April. A month later, I noticed that the polish was getting very thick. I read other reviewers stating the same thing, but hey it still worked. It just made for bigger crackles on my nails. Well yesterday I opened my bottle to use it only to discover that it is now a solid black glob inside the bottle. I only used this stuff a few times, so how could it possibly become a solid block? I have never had a nail polish do this before! And OPI is held in such high regards as to quality. I am now leery about buying anymore OPI products. I have other crackle products, mostly by China Glaze, and they have never even begun to get thick. Maybe I had a bad batch.