Electro-deposition, electrophorsis, electrodip, electrocoat etc.  Various names for the application of a coating onto metal surfaces by total immersion in a paint tank that is fully insulated and through which a current is passed causing and electrostatic attraction of paint resins and pigment onto the surface to be coated.

Advantages: provides high-quality coating on all external and most internal surface of a product, with controlled film-build, excellent corrosion resistance and efficient use of paint material.  Used extensively in car manufacturing, from body shell to component parts.  Electro-deposition is applied between the phosphate coating and the primer paint coating.

The process is fully automated, usually requiring only a single operator to maintain an efficiently run system.  The painting process takes care of itself, the operator performs daily chemistry checks, monitors system operation, ensures that adequate feed of resin and pigment are freely available to replenish the system, and carries out routine maintenance.

A well maintained system is capable of providing the highest first-run capability of any coating process.  Coating thickness is controlled by the electrical current with minimal variation over the entire workpiece.  Electro-deposition is particularly efficient in coating partially closed interior sections, for example in car body production, areas not accessible through normal spray application processes.