To preserve the value of trading vessels and to minimise fuel consumption, the paint coatings on trade vessels are repaired at certain intervals or completely renewed. When this is done, certain procedural requirements must be followed (apart from specific requirements for marine paints). These requirements relate to: large area output, arched contour of the vessels, paint coating in open air, and influences from wind and thermal currents. The project included the design and construction of a demonstration unit that avoids overspray emissions into the environment under the above-mentioned conditions. The main components of the large-scale demonstration plant are the building of: a coating head with enclosure, equipment carrier with vertical displacement unit and paint supply system with flushing installation and overspray disposal. With the aid of the developed paint coating system, the overspray may be vacuum-removed from a chamber enclosing the spraying nozzles.