Bought two of these in September 2020. One has opened up to use it and it certainly works well. Gorilla Glue products are excellent. I screwed the lid on tightly and placed it in a dark, dry, and cool cupboard. Yesterday about 7 months later I needed some gluing and I grabbed the bottle and found it was rock hard! Completely useless. I checked and the lid was definitely tight. Drat. Glad I bought two. Second opened which was still in the blister pack and everything was fine. So. The glue is excellent. It's not a cap. I don't know how the cap could be any tighter and I know super glue lasts a long time as I've had several bottles of it over the decades and it's always runny when I take it. Glue Gorilla = highly recommended! The bottle it's in = Not much.