MIRACLE Mason Bond is a solvent free, single component, moisture-cured structural adhesive specifically designed to bond concrete masonry units, decorative brick, stone, rock, wood, and many other materials. Mason Bond requires no sand, gravel or mixing. Mason Bond bonds quickly and completely with moisture present or in hot or cold weather conditions and provides 3.5 times greater bond strength than is required by code. Testing shows walls built with Mason Bond reduce water penetration by 80% compared to walls built with mortar. On most projects Mason Bond increases productivity by 50% compared to mortar resulting in a reduction in masonry construction costs.