1 The term "functional coating" covers a huge variety of possible surface functions. We consider "functional coatings" to be coatings having novel surface functions beyond classical decoration, corrosion protection, and surface protection. There are a huge number of approaches being pursued for developing functional coatings and some have very promising properties and functions on a lab scale. It is, for instance, not very difficult to create a surface that is extremely hydrophobic with a water contact angle of 150°. The major challenge is to make these approaches feasible for industrial use, which means consideration of aspects such as ...