A powdered post-add surface additive, BYK-3938 P offers an extremely user-friendly, label-free alternative for the matting of powder coatings. The additive can easily be added to the finished powder coating in the pre-defined quantity. The degree of gloss reduction depends on the dosage. The use of BYK-3938 P therefore makes it possible to cover a wide range of applications, from a few gloss units for adjustment during quality control through to deep-matte surfaces for decorative applications.