a useless adhesive product, if i could give less than a start i would. 3 pack, plastic bag, just to see how strong the bond is, after a minute in the light it started to harden and once it had hardened it didn't stick to any of the plastic pieces. So I tried styrofoam and glass, the zipper never fastened after a minute with the light on, it's just junk. These companies should be held accountable for this type of garbage. Maybe not glass. but plastic and polystyrene are not even a moment ofβ¦