Apparatus for spraying paint

In a method of coating a metal anode with electroconductive paint with an electrostatic spray gun while maintaining said gun at a high electrical potential and said anode at ground potential, the improvement which comprises:

• providing a diaphragm assembly having a flexible diaphragm separating a paint pumping chamber containing sufficient paint to coat the entire surface of the electrode and a pressurizing chamber;
• connecting the pumping chamber to the spray gun;
• introducing non-compressible fluid into the pressurizing chamber at a uniform continuous non-pulsating rate so that the diaphragm flexes and delivers the paint in the pumping chamber to the spray gun at said uniform continuous non-pulsating rate;
• and spraying the delivered electroconductive paint from the spray gun onto the surface of the anode at said uniform continuous non-pulsating rate.