| abstract |
【Task】 In the intermediate top coating wet-on-wet coating method, a mixed layer between an aqueous intermediate coating film and an aqueous base coating film is more strictly prevented, and a method for forming a multilayer coating film having excellent gloss is provided. [Solution] A water-based intermediate coating is applied (step (i)), pre-dried (step (ii)), and then a water-based base coating is applied (step) to the automobile body that has been coated with an electrodeposition coating. (Iii)), and further, a clear coating is applied, and the aqueous intermediate coating, the aqueous base coating and the clear coating are simultaneously heated and cured to form a multilayer coating. The water-based intermediate coating film has a viscosity of 100,000 to 1,000,000 Pa. At a shear rate of 0.1 second- 1 at a measurement temperature of 23 ° C. immediately before the step (iii). S, non-volatile content is 80% by weight or more. [Selection figure] None |