The main things I've learned:
Be sure things to be glued are very clean, free of dust, grime and grease.
Be sure everything is dry.
Use E6000 SPARINGLY! More is not better! The reason: E6000 does not stick well to itself. I put a small amount on the jewelry bail and the matching glass pendant, or a small amount on the glass butterfly and the matching mat board, for example. Next I spread it out very thinly on both surfaces with a small piece of heavy cardboard or a scrap of mat board. After waiting about 1-2 minutes, I press the two surfaces together and apply some weight. I don't move the piece for 24 hrs. to give the bond a good cure time.
I've not had any glue failure after applying the 'less is more' principle with E 6000. I would love to hear any tips or frustrations or comments you may have about E 6000. Or your recommendations about other glues that are 'out there'.
Be sure to browse my etsy shop! I have lots of fun pottery, fused glass, gourds, whimsical acrylic paintings and more. www.jackiesart.etsy.com