The colors have been very carefully chosen to provide the model-painter with the references most frequently employed. Tests have been carried out for over two years to develop the tonalities which correspond to the RLM, RAL and FEDERAL STANDARD colors commonly used. Model Air adheres exceptionally well to all surfaces. The adhesion of Model Air to resin models, plastics, steel and white metal is extraordinary. The pigments used for airbrush colors need to be ground to the finest possible consistency to avoid obstruction of the airbrush valves. The revolutionary milling process of the pigments used in the Model Air formula gives the model-painter technical assurance and finest texture when applying the colors to the model, and produces a very superior quality when applying the colors with a brush for miniscule details, for washes and transparencies and layered application of diluted glazes.