Patent ID: 7763322
Filing Date: 2010-07-27
Classification: B05D

Abstract:
1. A process for overcoating a multicoat color and/or effect paint system, wherein the process is carried out on a line at an automaker's plant and wherein the multicoat color and/or effect paint system, which is an OEM finish on a motor vehicle produced by means of electrostatic spray application, comprises at least one color and/or effect basecoat (A) produced from at least one aqueous basecoat material (A) and at least one clearcoat (B) produced from at least one liquid clearcoat material (B), the process comprising: (1) applying to an outer surface of the multicoat paint system by pneumatic spray application a clearcoat material that is an extract of an aqueous basecoat material, which substantially corresponds or is identical to the at least one aqueous basecoat material (A) from which the basecoat (A) was produced, to form a resulting film (1), wherein the extract is a coating material which comprises a binder and crosslinking agent that are the same as a binder or binders and crosslinking agent or agents in the aqueous basecoat material (A), (2) flashing off and/or drying the resulting film (1) without curing it completely, (3) coating the resulting flashed off and/or dried film (2) by pneumatic spray application at a spraying pressure less than the pneumatic spray in step (1) with an aqueous basecoat material which substantially corresponds or is identical to the at least one aqueous basecoat material (A) from which the basecoat (A) was produced to form a resulting aqueous basecoat film (3), (4) flashing off and/or drying the resulting aqueous basecoat film (3) without curing it completely, (5) coating the resulting flashed off and/or dried aqueous basecoat film (4) with at least one liquid clearcoat material to form at least one resulting clearcoat film, and (6) jointly curing the at least one resulting clearcoat film (5), the aqueous basecoat film (4), and the film (1), and, where present, any further uncured films that are present, wherein the process is used for overcoating an entire area of the multicoat paint system or for overcoating a defect to the multicoat paint system and all of the adjacent area up to a boundary.