Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Adhesive is no good. They all fall off after a few weeks

I have to say I'm terribly disappointed with these. I stuck them to smooth, clean, bare metal, and smooth, clean painted metal while routing some small wires in a laboratory. I spent a lot of time making it look nice, only to have every single one just fall off after a few weeks. They were very sticky when I first applied them, but over time, the adhesion just seemed to go away. Now I will have to come up with a different solution. Oh the wasted time... By the way, there was no heat or anything that would have caused this.