Sag control agents (SCA) have been successfully used to modify resins for several years to improve the appearance of glossy coatings. By introducing thixotropy into the paint, SCA-modified resins increase the sag resistance while still maintaining good levellingoff of surface irregularities generated during paint application [1]. This not only improves the appearance in general but it also improves robustness, as paints containing SCA-modified resins are less sensitive, for instance, to variations in the applied layer thickness, solvent evaporation speed, panel orientation, and type of basecoat and substrate. ...