Formulated to provide long-term protection by reducing permeability and absorption, Krystol Mortar Admixture is a dry powder added to the cementitious mortar during mixing. It can transform highly porous mortar into a water-resistant, crack-resistant barrier that withstands even the harshest elements and may be used over concrete masonry walls, mortars, and masontry units. Kryton International Inc. 800-267-8280.