| abstract |
This method for forming a multi-layer coating film comprises: a step (1) for coating an aqueous two-component first coloring coating material (X) and forming an uncured first colored coating film; a step (2) for coating an aqueous one-component second coloring coating material (Y) and forming an uncured second colored coating film; a step (3) for coating a solvent-based two-component clear coating material (Z) and forming an uncured clear coating film; and a step (4) for heating and simultaneously curing the uncured first colored coating film, the uncured second colored coating film, and the uncured clear coating film to 75-100°C, wherein the solvent-based two-component clear coating material (Z) contains a hydroxyl group-containing acrylic resin (Z1) and a polyisocyanate compound (Z2) such that isocyanate groups in the polyisocyanate compound (Z2) are contained at a ratio of 1.5-2.0 equivalents with respect to 1 equivalent of hydroxyl groups in the hydroxyl group-containing acrylic resin (Z1). |