Hardman Double Bubble "Green" Crystal Clear (Clear as Water) Epoxy 5 Packs (#04004) Dries Crystal Clear / Clear as Water, 60 minute working time Excellent for repairing jewelery, crystal, glass, electronics, optical equipment & lenses Unique double packs are clean and easy to use, with very little left-over waste 2-year shelf life means epoxy will not harden on the shelf! High bond strength 2,400+psi