| abstract |
Provided is a method for forming a multilayer coating film, which is capable of forming a multilayer coating film that exhibits excellent curability at low temperatures, while having excellent hardness and excellent finish appearance. A method for forming a multilayer coating film, which sequentially performs: (1) a step for forming an uncured first color coating film by applying a two-package type aqueous first color coating material (X) onto an object to be coated; (2) a step for forming an uncured second color coating film by applying a one-package type aqueous second color coating material (Y) onto the uncured first color coating film obtained in the step (1); (3) a step for forming an uncured clear coating film by applying a two-package type clear coating material (Z) onto the uncured second color coating film obtained in the step (2); and (4) a step for curing the uncured first color coating film, the uncured second color coating film and the uncured clear coating film, which are formed in the steps (1)-(3), at the same time by heating these coating films. This method for forming a multilayer coating film is configured such that the one-package type aqueous second color coating material (Y) contains a specific hydroxyl group-containing acrylic resin (Y1), a specific hydroxyl group-containing polyester resin (Y2), and a blocked polyisocyanate compound and/or a melamine resin (Y3). |