Life Specialty Coatings LD81 5 gal Life Deck High Solids Cement Modifier. As a primer for resurfacing systems, LD-81 is a high solids acrylic-polymer modifier that will give increased strength, flexibility and adhesion to most cement based products. LD-81 acts as a great primer when mixed with water for decorative concrete and resurfacing systems. LD-81 makes the cement product more water resistant, stain resistant, increased psi, and increased adhesion to extend the life of concrete. LD-81 cement modifier makes a great primer for Life Deck cements by increasing adhesion and bonding.