What did you use the E6000 for D? Whether or not it works might depend on what you were gluing together.
E6000 is not a universal product for rvery thing that needs gluing...a question to consider would be were the surfaces of the glued item clean before you tried to glue it?.
I used it on an outdoor statue and it did not hold, the heat was too much for it. I ended up using marine glue which worked.
What do you need to glue together?
It doesn't work when it's old, so I've had it fail then.
It has always worked for me but the drying time is a bit long. Sorry you had a bad experience.
It sounds like you did it right. Did it rain or was there a lot of dampness in the air? That's all I can think of.