Two-part epoxy forms maximum-strength rifle bedding, and helps repair non-critical metal parts. Fills voids, cracks and machine marks; excellent bonding strength for many wood-to-metal and metal-to-metal applications. Machinable after 4 hours; fully cures in 16 hours, or reduce cure time by applying heat per the manufacturer's instructions. Highly resistant to chemicals and acids. Steel, Aluminum and Titanium available as putty. Steel also available as liquid for easy flow into tight areas, and making molds, fixtures and light gauge forming dies. Steel Putty and Titanium Putty meet Mil-Spec DOD-C-24176B(SH), Steel Liquid meets Mil-Spec MMM-A-1754, and Aluminum Putty meets Mil-Spec DOD-C-2417 Mfg: Devcon Express SPECS: Steel Putty - 1 lb. (454g) resin, 3.4 oz.(96.4g) hardener. Steel Liquid - 1 lb. resin, 2.6 oz. (73.7g) hardener. Aluminum Putty - 1 lb. resin, 3.3 oz. (93.6g) hardener. Titanium Putty - 1 lb. resin, 4.6 oz. (130.4g) of hardener. All include instructions.