Method for producing and repairing a multicoat color and/or effect paint system

A method for reducing reversible defects in a multicoat color and/or effect paint system after moisture exposure, the method comprising

• (1) applying a pigmented aqueous basecoat material to a substrate, wherein a binder component of the pigmented aqueous basecoat material comprises at least one saturated or unsaturated polyurethane (meth)acrylate resin and at least one polyester;
• (2) drying the pigmented aqueous basecoat material applied to the substrate in stage (1) without curing;
• (3) applying a clearcoat material to the dried pigmented aqueous basecoat;
• and subsequently
• (4) curing the dried pigmented aqueous basecoat film together with the clearcoat,
• wherein in stage (1) a phosphite component of the pigmented aqueous basecoat material consists of at least one phosphite of the following structural formula (I):
• wherein structural formula (I) is selected from the group consisting of triisodecyl phosphite, triisotridecyl phosphite and phenyl diisodecyl phosphite, and wherein the sum total of the weight percentage fractions of all of the phosphites of structural formula (I) is 0.15% to 4% by weight, based on the total weight of the aqueous basecoat material applied in stage (1).