Instruct: Classify an Amazon review into positive or negative sentiment.
Query: thick and sturdy but gets mildew

As a curtain liner it is not bad, but I bought it because it says "Will not mildew" on the package. I bought 3 at a time and have replaced them all within a few months due to mildew buildup. I've finally gone through all 3 that have gotten gross and I look forward to trying a new brand!