Paint Sprayers, Caulking Guns - Pneumatic Plastering Gun, Pneumatic Mortar Sprayer - Pneumatic Facade Sprayer This pneumatic plastering gun is also called a concrete spray gun or concrete sprayer. It is most often used for applying concrete, cement, or mortar to your brick or cinder block wall (unfinished). Capacity: 6L Pressure 3 nozzles: 4, 6, and 8 mm diameter Aluminum tank Works with an air compressor