Stone Edge Surfaces Wall Mix AddPak (Vertical Concrete Mix Additive) Common Uses: Vertical Stamping and carving of interior/exterior walls, block and retaining walls, home facades, waterfalls, fireplaces, outdoor kitchens and more. It is a High-strength, lightweight, polymer enhanced mix of additives that is mixed with Type “S” Mortar to produce a custom concrete veneer on vertical surfaces. Mixes with an 80lb Bag of Type “S” Mortar and water to produce a user-friendly cementitious mix that can be applied up to 3” to 5” thick. Typically applied ½” to 1” thick to be stamped or textured, hand-carved and colored to produce the look of natural hand laid stones. Provides almost 100% contact to substrate to eliminate all voids that can happen with natural stone and stone veneer and cause water & insect intrusion, deteriorated mortar joints and delamination. Available in gray or white. Packaged in 9 lb. bags. Just add water.