Instruct: Classify Amazon reviews into positive or negative sentiment
Query: NOT Waterproof (despite product description)

I purchased this cover this summer, wanting to keep a teak patio set protected from the harsh sun & rain. Recently, I left the cover on for several weeks (no more than 3), and this afternoon when I took it off I noticed that the rain had soaked through onto the table top and left a stain on the table surface. I would have been better off not covering it at all, as now there is uneven staining that is unsightly.What's worse than the defective product is that it appears that I'm not able to return it, as the window has expired.Look elsewhere if you want a realiable weatherproof product.