glue used for glass

What I am finally going to do is take all the glass things I have collected and make a birdfeeder or something out of them for the garden. Today there was a gal selling them, and all I wanted to know was the glue she used. She was ticked off.
I even offered her some of the glass items just for the knowledge of the glue used.

I want this to hold up outside, in a ton of rain.

Any help would be super appreciated and also if you have made one please post as I think they are super neat.

D