Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointed

I bought the 3M brand because it was supposed to have a stronger adhesive than the Frost King brand I used last year. Unfortunately, after about 6 weeks, the plastic on *every* window is pulling away from the adhesive. Much worse than the product I used last year.I've seen some people say the lack of adhesion is due to not cleaning the surface properly, however, this doesn't account for the fact that the plastic is pulling away from the *tape*, which is still stuck to the window still.