abstract |
Disclosed is a method whereby a multilayer coating film having excellent smoothness, vividness and chip-resistance can be formed by the three-coat one-bake system which comprises successively applying a first water-based color coating, a second water-based color coating and a clear coating onto an article to be coated and then simultaneously heating and curing the three-layered coating film thus obtained. Specifically disclosed is a multilayer film coating-forming method of the three-coat one-bake system which comprises successively applying a first water-based color coating (X), a second water-based color coating (Y) and a clear coating (Z) onto an article to be coated and then simultaneously heating curing the three-layered coating film thus obtained, characterized in that said first water-based color coating (X) is a water-based coating composition comprising an acrylic resin (A), a curing agent (B) and a urethane resin emulsion (C), and a first color coating film formed by applying said first water-based color coating (X) has a water swelling ratio equal to or less than 100% and an organic solvent swelling ratio equal to or less than 300%. |