| abstract |
【Task】 Provided is a method for forming a multilayer coating film that can obtain excellent smoothness even when the surface smoothness of an electrodeposition coating film is inferior in a three-wet coating process using a water-based paint for an automobile body. [Solution] After the electrodeposition coating is applied and the baking is completed, the aqueous intermediate coating is applied (step (i)), setting (step (ii)), and pre-drying (step (iii)). Subsequently, a water-based base paint is applied, and further a clear paint is applied, and the intermediate coating film, the base coating film and the clear coating film are simultaneously heated and cured to form a multilayer coating film. The viscosity and non-volatile content of the coating film formed from the paint are in specific ranges immediately after step (i) and immediately before step (iii), respectively. [Selection figure] None |