Our specialized shotcreting services include bolting, scaling, ventilation shaft rehabilitation, and the meshing of shafts, tunnels, manholes and bridge structures. We'll work with you to get the most out of your existing infrastructure and to ensure its safety. What is it? Shotcreting or Guniting is the act of spraying a concrete or mortar mixture through a nozzle using compressed air. Shotcrete is an efficient, durable lining and an extremely versatile construction and restoration material. An air compressor is used to power a spray rig. It is sprayed over a rebar mesh that is held above the soil with small bricks or the such. No aggregate is used.