Bests & Worsts Reviews from Amazon

I bought this to try to fix a broken pair of glasses. I decided to try it first on a pair of over the ear headphones that the plastic housing which holds the ear cup had cracked. The included instructions (such as they are) are poorly worded. My thought is they were translated into English from another language. The instructions did say to sand both ends to be bonded, then clean them with rubbing alcohol. Did all that. It was recommended to do the repair in thin layers, curing between each layer. Did 4 or 5 thin layers, curing 6-10 seconds between each, although nowhere in the instructions did it say how long you were supposed to cure it. Initially, the bond appeared to be pretty strong, so I figured it was a success. I put the headphones on the shelf where I keep them, where they sat untouched for 4 full days. Just picked them up to use them, only to find the bond broken back to where it was before I tried to fix it. No one has touched them, so all I can say is the stuff doesn't work as advertised. Now, I'm out $20 for the product plus overnight shipping and am stuck with broken headphones that have the epoxy all over them. No way am I trying this on my glasses. I guess I need to buy new headphones, which is what I should have done instead of wasting almost $30 on this useless junk.