Resinlab Armstrong A-12 Epoxy Adhesive Hardener Part B is a two-component epoxy curing agent designed to be used with the corresponding Part A resin for strong structural bonding applications. It delivers excellent adhesion to metals, composites, and plastics, while providing high mechanical strength and durability. Supplied in a 1-quart can, this gray hardener is ideal for industrial assemblies requiring reliable performance and long-term stability.