I am trying to glue porcelain to sterling silver rings (cabochon style glue setting) and I am having such trouble with the glues. I have the jeweler's glue (GS Hypo cement), jeweler's epoxy, and E6000. I tried on 3 different porcelain plates and just didn't want to set, even after 12-24 hours of wait time. It stays on just long enough for me to wear it. Then the plate would fall off. The porcelain plate in question has no glaze on the bottom so the surface is rough. I cleaned both the plate and the sterling silver ring and roughen up the surface on the contact point for the ring and the plate BUT still it won't stay.
The only thing that seems to work is extra strength superglue. There are no apparent gaps in the contact point either. So far it has stayed faithfully on the ring without falling off (despite me yanking as hard as I can, pushing it, etc...) for a month now.
This is the ring in question btw:
And the finished project with superglue
And... what the contact point looks like (it covers the entire bottom of the glue base) and the porcelain plate is flat on the bottom.
SO... here are my questions:
1) Any suggestions to why is this happening?
2) Should I just use superglue if it works?
3) Do you recommend using superglue on rings long term? As I said it has worked very well on staying for a month now.
Any insight would be appreciated. Thank you very much for helping and I hope you have a wonderful day.