A good architectural paint has to meet many requirements. As a façade paint, for example, it should look good and be as durable as possible. For which of us wants to keep painting our house over and over? One of the most important functions, however, is how the paint responds to wet conditions. A good coating, for example, will be sufficiently hydrophobic to ensure that water flows off as quickly as possible in rain or fog, thus depriving algae and fungi of their "life's blood". At the same time, the coating has to remain permeable to water vapour to allow ...