I've a bunch of fused glass "buttons" that I need to attach posts and clips to. I've tried CA cyanoacrylate (superglue) of various viscosities, and have RTV and 5-minute epoxy currently under test. (but don't have the results yet from the RTV and epoxy that is currently being evaluated). The glass "buttons" range from about 1/2" to 3/4" diameter, and the pads on the clips and posts range from 8mm to 10 mmm in diameter. Most "buttons" are two layers of glass, though some are three layers of glass thick (before firing).
With the CA glue, some seemed to stay attached OK, but about 50% would be fairly easy to dislodge the post or clip after a week or two (and I'm telling you the temperature cycling here isn't all that wide, it's on the order of maybe 65 to 85 degrees F, night to day on the worst range the past couple of months. I'm not willing to put something into the public that fails 50% before I ship it... Strangely, the units I put through the freezer (2 to 4 degrees F and ambient day of 82-87 degrees F) didn't have any higher failure rate than just sitting on the shelf.
What do you use for attaching glass to findings? What prep do you do prior to bonding? What sort of failure rate do you see for the bond?
I can easily clean (various solvents), etch (chemical etch), and beadblast or sandblast, and if it is really needed, can put other processes in place. I really want something that will last as long as possible....
Thanks
--Rick