A handheld airless fluid dispensing device comprising: a fluid pump for directly pressurizing an architectural coating; a drive element for supplying power to the fluid pump; a spray orifice connected to the fluid pump; wherein the fluid pump, the drive element and the spray orifice are integrated into a handheld housing comprising a housing body; a reciprocating piston fluid pump comprising the fluid pump disposed within the housing body; characterized in that the spray orifice is approximately 0.029 square inches (∼18.7 mm 2) in area or smaller and is adapted to atomize pressurized un-thinned architectural coating to a particle size of no greater than approximately 150 microns; the reciprocating piston fluid pump comprises at least two pumping chambers configured to be actuated out of phase by at least one piston, the primary drive element being coupled to the housing body and connected to the reciprocating piston fluid pump to actuate the at least one piston; and a spray tip is connected to an outlet of at least one of the pumping chambers; the fluid pump further comprising: a first cylinder having a first chamber; a first piston disposed in the first chamber; a second cylinder having a second chamber; a second piston disposed in the second chamber; and first and second inlet valves and first and second outlet valves connected to the first and second cylinders, respectively; wherein the displacement of the first cylinder is larger than a displacement of the second cylinder. a fluid pump for directly pressurizing an architectural coating; a drive element for supplying power to the fluid pump; a spray orifice connected to the fluid pump; wherein the fluid pump, the drive element and the spray orifice are integrated into a handheld housing comprising a housing body; a reciprocating piston fluid pump comprising the fluid pump disposed within the housing body; characterized in that the spray orifice is approximately 0.029 square inches (∼18.7 mm 2) in area or smaller and is adapted to atomize pressurized un-thinned architectural coating to a particle size of no greater than approximately 150 microns; the reciprocating piston fluid pump comprises at least two pumping chambers configured to be actuated out of phase by at least one piston, the primary drive element being coupled to the housing body and connected to the reciprocating piston fluid pump to actuate the at least one piston; and a spray tip is connected to an outlet of at least one of the pumping chambers; the fluid pump further comprising: a first cylinder having a first chamber; a first piston disposed in the first chamber; a second cylinder having a second chamber; a second piston disposed in the second chamber; and first and second inlet valves and first and second outlet valves connected to the first and second cylinders, respectively; wherein the displacement of the first cylinder is larger than a displacement of the second cylinder. a first cylinder having a first chamber; a first piston disposed in the first chamber; a second cylinder having a second chamber; a second piston disposed in the second chamber; and first and second inlet valves and first and second outlet valves connected to the first and second cylinders, respectively; wherein the displacement of the first cylinder is larger than a displacement of the second cylinder.