This product is designed as a binder for elastomeric wall coatings. This emulsion produces durable coatings with the excellent elongation and recovery characteristics necessary to bridge dimensionally unstable cracks without cracking or wrinkling. The product employs a chemistry that imparts excellent dirt pickup resistance to coatings based on it. As a result, these formulations retain an attractive appearance as they age. In addition to elasticity and durability, coatings based on this product are permeable to water vapor, which permits moisture in the masonry substrate to escape without causing blisters.