1 The changes in our climate will be the biggest challenge. The impact from dirt, fungal or algal growth and increasingly air pollution in larger cities are pushing the limits of technologies and the capabilities of exterior masonry paints. The influence of rising temperatures will also have an impact on the durability of films, and extreme weather conditions will shorten the application time further. The ever expanding legislative framework for low VOC, no solvent-regulations and limits for biocides leaching all pose further challenges to the stability of architectural coatings. All together, these challenges will set new requirements to ...