Patent ID: 8221848

Claim:
A method for forming a multilayer coating film, comprising applying a first clear paint onto a coating object to form a first clear coating film, applying onto the first clear coating film which is either uncured or cured by heating, a second clear paint to form a second clear coating film such that the second clear coating film has a heat-cured film thickness within a range of 2-15 μm, wherein: (a) the first clear paint and the second clear paint comprise hydroxyl-containing resin as a base resin and polyisocyanate compound as a crosslinking agent, and (b) when the first clear paint is applied and cured by heating at 140° C. for 30 minutes to form a first clear coating film having a cured thickness of 40 μm, and a dynamic viscoelasticity of the so formed first clear coating film is measured at a frequency of 11 Hz, the so formed first clear coating film has a glass transition temperature of lower than 70° C. and a tan δ (=loss elastic modulus/storage elastic modulus) at 80° C. of less than 0.4, and when the second clear paint is applied and cured by heating at 140° C. for 30 minutes to form a second clear coating film having a cured thickness of 40 um, and a dynamic viscoelasticity of the so formed second clear coating film is measured at a frequency of 11 Hz, the so formed second clear coating film has a glass transition temperature of at least 70° C.