Devcon® Plastic Steel Epoxy - Dual Pak, 2 oz.

Steel-filled heavy-duty epoxy for forming a protective backing on turquoise and other stones. Extremely high bond strength. Can be used to fill holes and gaps. Sets in 2 hours, full bond strength reached in 16 hours. Hardens to a rigid metallic mass. Sandable, chemical-resistant and waterproof. Metallic gray in color.

This Devcon® Plastic Steel Epoxy comes in a package of 2 individual 1 ounce tubes (one of resin and the other of hardener).  Squirt out equal amounts and combine them to create the epoxy.