the forwardly protruding section 12 of the duct or tube 10 by means of a bearing 48 so as to be rotatable about the axis of rotation 4 as a result of the rotation of the nozzle 32 and the aperture 34 the particles of the axial powder stream are entrained in eddy fashion about the axis of rotation 4 the powder particles in the cloud 38 are thereby driven outward in a direction radially to the axis of rotation 4 and thus are more evenly distributed within the powder cloud 38 than would be possible without rotation of the nozzle 32 however the atomization of the coating powder is not adversely affected by the rotation in a modified embodiment of the spray apparatus the coating powder is atomized by a diffuser effect rather than by a nozzle effect the rotation can aid the atomization one or more high voltage electrodes 18 are located in the nozzle 32 within or beside the flow path for the coating powder 36 and within or near the spray aperture 34 the electrodes 18 are located where they can electrostatically charge the coating powder flow 36 as is known in the art the high voltage electrodes 18 may be swept by a separate flow of electrode air to prevent powder particles from clinging to the electrodes the air flow also drives ions into the powder stream 36 as an alternative to the location for the electrodes 18 around the internal circumference of the nozzle 32 as shown.