Abstract: Dispensing systems and methods for stucco and similar materials. The system comprises a dispensing assembly and a cartridge assembly. The dispensing assembly comprises a piston pushing assembly, an outlet assembly, and a structural assembly for holding the piston pushing assembly in a fixed relationship to the outlet assembly. The cartridge assembly can contain the material to be dispensed and is mounted within the dispensing assembly. Operation of the piston pushing assembly forces stucco or other material to move from the cartridge assembly to a mixing chamber portion defined by the outlet assembly. At the mixing chamber portion, the stucco material is mixed with a stream of pressurized air which carries the mixture out of the system and deposits the material onto a surface to be coated. The system allows substantial control over the manner in which the stucco or other material is sprayed.