Method for film formation

摘要

The present invention provides a method for film formation, which comprises applying onto a substrate an electrocoating (A) and an intermediate coating (B) in this order, heat-curing the formed films of the coatings (A) and (B), applying thereon a liquid deep color coating (C) which comprises 100 parts by weight of a thermosetting resin composition, 0.1-30 parts by weight of an aluminum powder having an average particle diameter of 10 mu or less, 1-100 parts by weight of a titanium oxide pigment and 0.1-10 parts by weight of a carbon black pigment and which shows a film hiding power of 25 mu or less and a film elongation ratio of 10-50% at 20 DEG C., a liquid color clear coating (D) which comprises a thermosetting resin composition and a color pigment as the main components and which shows a film hiding power of 50 mu or more and a film elongation ratio of 10% or less at 20 DEG C., and a clear coating (E) in this order on a wet-on-wet basis, and heating the formed films of the coatings (C), (D) and (E) to crosslink and cure the three films simultaneously. According to the method, part of the heat-curing steps employed in multilayer film formation can be eliminated and a multilayer film of smaller thickness and improved properties (e.g. improved surface smoothness and chipping resistance) can be obtained.