Method for producing a multicoat paint system by postadditization of at least one basecoat with an aqueous dispersion comprising polyamides and/or amide waxes

A method for producing a multicoat paint system (M) on a substrate (S), comprising

• (1) optionally producing a cured first coat (S1) on the substrate (S) by application of a composition (Z1) to the substrate (S) and subsequent curing of the composition (Z1),
• (2) producing a basecoat (BL2a) or two or more directly successive basecoats (BL2-x) directly on the first coat (S1) by application of an aqueous basecoat material (bL2a) directly to the first coat (S1) or directly successive application of two or more aqueous basecoat materials (bL2-x) directly to the first coat (S1),
• (3) producing a clearcoat (K) directly on the basecoat (BL2a) or on a topmost basecoat (BL2-z) by application of a clearcoat material (kL) directly to the basecoat (BL2a) or to the topmost basecoat (BL2-z),
• (4) jointly curing the basecoat (BL2a) and the clearcoat (K) or the basecoats (BL2-x) and the clearcoat (K),
• wherein
• the basecoat material (bL2a) or at least one of the basecoat materials (bL2-x), directly prior to application, is mixed
• with an aqueous dispersion (D1) comprising at least one polyamide (PA) having an acid number of 20 to 50 mg KOH/g or
• with an aqueous dispersion (D2) comprising at least one polyamide (PA) and at least one amide wax (AW).