1 There are still rooms for improvement in water-borne paints in general and this is even more valid for anti-corrosive applications. Water-borne coatings have some disadvantages compared to their solventborne countertypes in water resistance and anti-corrosive performance. The root cause of the disadvantages arise from the nature of the water itself, which are very difficult to overcome. It is still not possible to fulfill some highly demanding anti-corrosion requirements, such as described in ISO 12944 C5 medium and to some extent even in C4, with water-borne coating systems. I will try to classify the basic disadvantages and their causes. Application ...