The 2 part epoxy is much better then GS and can be used on both glass and plastic. Mix it together with a tooth pick and then apply it with a tip of a small screw driver all around the bezel. Dries slow so you can take your time. No clean up is needed if you are carefull. Any lamp with a 100 watt blub pointed down over the crystal or from the underside will dry/harden it quickly. 10-20 minutes does it. The metal tip on the GS is a real mess and gets to much of that rubbery GS cement on the bezel. It realy does not hold that well over time. Real pros never use GS cement.UV is good for glass crystals and the GS cememt is good for the plastic ones.