Apparatus and process for surface treating interior of a workpiece

A method of treating an interior surface of a workpiece comprising:

• providing at least three nozzles ejecting treating material, a first one and a second one of the at least three nozzles ejecting the treating material substantially along a first line and a second line, respectively, the first line and the second line being substantially collinear, a third one of the at least three nozzles ejecting the treating material substantially along a third line substantially perpendicular to the first line and the second line;
• intersecting the treating material ejected from the first one of the at least three nozzles with the treating material ejected from the second one of the at least three nozzles at a first intersection area;
• radially deflecting the treating material ejected from the first one of the at least three nozzles and the treating material ejected from the second one of the at least three nozzles at the first intersection area to form a first radial spray of treating material;
• intersecting the treating material ejected from the third one of the at least three nozzles with the first radial spray at a second intersection area;
• radially deflecting the treating material ejected from the third one of the at least three nozzles and the first radial spray at the second intersection area to form a second radial spray of treating material;
• and
• treating the interior surface of the workpiece adjacent the second intersection area with the treating material of the second radial spray.