METHOD OF FORMING MULTI-LAYER PAINT FILMS, BASE COAT COMPOSITION AND METHOD OF PAINTING

摘要

To form multi-layer paint films which have a good finished appearance on objects which are to be painted, using an aqueous base coat composition. An aqueous base coat composition which contains aqueous polyurethane resin and rheology control agent, the electrical conductivity measured in an aqueous solution of 3 % by weight concentration of which is 700 - 900 mu S/cm, is painted and then the paint film is formed, a transparent top coat is painted on the base coat paint film obtained in this way, and the base coat and the top coat are baked at the same time.