Abstract: One embodiment of a hand held elongated material cylinder (4), capped on one end having a pistol gripped trigger assembly (8), for the introduction of compressed air against free floating piston (6), utilized for the propulsion of wet-mix cementitous materials, loaded in the opposing side of the cylinder (4), enclosed with a nozzle cap (10), introducing compressed air around its tapered circumference, used for expelling the propelled material through a flexible nozzle tip (12) with a reduced aperture, at velocity to a described substrate needing repair or coating.