A self-contained, hand-held spray dispensing device for dispensing two liquid materials, each material being carried in a container (52,54) having a discharge port (52Q, 54Q), each container (52, 54) having a liquid ejecting element associated therewith, each liquid ejecting element being connectable to a force transmitting yoke having a working surface thereon, each container being responsive to a force imposed by the liquid ejecting element thereby to cause a liquid material in that container (52, 54) to be ejected from the discharge port (52Q, 54Q), the dispensing device comprising: • a housing; • two liquid discharge lines (62, 64) disposed within the housing, each liquid discharge line (62, 64) extending through the interior of a discharge head from an inlet end (62I, 64I) to an outlet end (62E, 64E) located at a forward tip of a nozzle; • a container support arrangement able to receive and to support two liquid containers within the housing such that the discharge port (52Q, 54Q) of each container is disposed in fluid communication with the inlet end of a liquid discharge line (62, 64); • an actuator disposed within the housing, the actuator being operative to apply a motive force to a working surface of a yoke receivable within the actuator; • a cartridge support arrangement disposed within the housing, cartridge support arrangement being able to receive and to support a cartridge holding a pressurized fluid; • a first pressurized fluid line able to convey a pressurized fluid from a cartridge receivable within the housing into the actuator; • a valve able to control the flow of a pressurized motive fluid through the pressurized fluid line; and • a trigger operatively associated with the valve, the trigger being movable from a rest position to a first operational position, when in the first operational position the trigger being operative to open the valve to permit a pressurized motive fluid from a cartridge receivable within the housing to flow through the pressurized fluid line into the actuator to generate a motive force on the working surface of a yoke receivable within the actuator, thereby to cause each liquid ejecting element to eject a liquid in the container through the discharge port thereof; wherein the device further comprises: • a second pressurized fluid line able to convey a pressurized fluid from a cartridge receivable within the housing, which second pressurized fluid line includes two sleeves (68, 70), each sleeve being disposed in surrounding relationship about the outlet end (62E, 64E) of each liquid discharge line, • the valve also able to control the flow of a pressurized fluid through the second pressurized fluid line; and • the trigger, when in the first operational position, being operative to control the valve to permit a pressurized fluid to flow through the second pressurized fluid line, whereby a flow of pressurized fluid is able to pass over the outlet ends of the liquid discharge lines to generate an aerosoling action on any liquid material emanating from the outlet ends of the liquid discharge lines. • a housing; • two liquid discharge lines (62, 64) disposed within the housing, each liquid discharge line (62, 64) extending through the interior of a discharge head from an inlet end (62I, 64I) to an outlet end (62E, 64E) located at a forward tip of a nozzle; • a container support arrangement able to receive and to support two liquid containers within the housing such that the discharge port (52Q, 54Q) of each container is disposed in fluid communication with the inlet end of a liquid discharge line (62, 64); • an actuator disposed within the housing, the actuator being operative to apply a motive force to a working surface of a yoke receivable within the actuator; • a cartridge support arrangement disposed within the housing, cartridge support arrangement being able to receive and to support a cartridge holding a pressurized fluid; • a first pressurized fluid line able to convey a pressurized fluid from a cartridge receivable within the housing into the actuator; • a valve able to control the flow of a pressurized motive fluid through the pressurized fluid line; and • a trigger operatively associated with the valve, the trigger being movable from a rest position to a first operational position, when in the first operational position the trigger being operative to open the valve to permit a pressurized motive fluid from a cartridge receivable within the housing to flow through the pressurized fluid line into the actuator to generate a motive force on the working surface of a yoke receivable within the actuator, thereby to cause each liquid ejecting element to eject a liquid in the container through the discharge port thereof; • a second pressurized fluid line able to convey a pressurized fluid from a cartridge receivable within the housing, which second pressurized fluid line includes two sleeves (68, 70), each sleeve being disposed in surrounding relationship about the outlet end (62E, 64E) of each liquid discharge line, • the valve also able to control the flow of a pressurized fluid through the second pressurized fluid line; and • the trigger, when in the first operational position, being operative to control the valve to permit a pressurized fluid to flow through the second pressurized fluid line,