Acronal A 509 Acrylic BASF Acrylic Resins Architectural / Decorative Pure acrylic dispersions have an excellent weathering resistance. Therefore they are the first choice for binder-rich outdoor systems as eg, gloss and wood paints. Acronal A 509 Elastic, outstanding weathering resistance Elastic coatings Pure acrylic dispersion. Used for binder-rich outdoor systems such as elastic coatings. Offers elastic properties and outstanding weathering resistance.