High-performance epoxy adhesives applied by the “spot bonding†or “dab†method are used on approximately 10% of the veneer surface, thus providing a ventilation gap behind the stone. This is an important advantage because it will reduce the potential for water staining and efflorescence. These specialized epoxies are strong (shear bond strengths in excess of 1,100 psi), and yet flexible enough to handle building movement and stress. The two main advantages of high-strength epoxy adhesives over the traditional method of mechanical anchoring are described below.