Structural Skin is applied from 1/8 to 1/4 inch thick over concrete block, brick or concrete to create a uniform, waterproof surface. Add 2 quarts of K-88 Admix for Exterior Wall Systems. Add 2 quarts of K-88 Admix for applications of polystyrene foam. Add 1 quart of K-88 Admix for applications over concrete, brick or other dense substrates. Structural Skin eliminates the need to re-point masonry prior to coating. Use Structural Skin on both sides of dry stacked (eliminate the mortar joints) concrete block to build structural walls.