@OhButtonMe I use Collall glue for my mosaics, I often use metal or glass on glass and it sticks very well. I like it better than silicone which I think would be another good suggestion as it will bend and not snap, It works equally well indoors and out. I have some samples of an excellent silicone that I can gift you if you pay the postage. I also sell small bottles of 2 types of Collall, one is a PVA (the one I always use) - it says Wood glue on the label and one they call Universal which is also excellent. Neither have toxic fumes like E6000 and Hypo so its safe to use without ventilation. Be really careful with glues and your lungs. A close friend of mine, also a mosaic artist, has recently been diagnosed with a terminal llung disease that they attribute to the years of glue and cement use. Let me know if you want to try the silicone and I would be happy to send it to you for the postage.