Surfaces are coated for various reasons, including aesthetics and protection. For protection against e. g. corrosion, it is particularly important to ensure a continuous film with excellent adhesion. The required adhesion between the coating film and the substrate can only be achieved via excellent wetting of the substrate by the liquid coating formulation. Having a lower surface tension of the liquid coating relative to the surface tension of the substrate is the most decisive factor for optimum substrate wetting. Adding surfactants is an easy way of reducing coating surface tension [1]. This lowers the contact angle of the liquid coating ...