The development of defoaming additives is steadily progressing and there are therefore always new and improved additives on the market. Some modern additives provide the desired defoaming effects by themselves, in contrasts to previous additives that needed to be used in combination with other additives. The task of this bachelors thesis was to evaluate the possibility of using these improved defoaming additives, with the aim to find alternatives that give the system better defoaming attributes while, at the same time, using less of the primary products. The tests were carried out in the coating type Teknocryl Aqua Combi 2780. The coating is a waterborne air drying acrylat-latex/alkyd based coating that can be used for both single coat painting and primer. The results showed that there are good possibilities of replacing the current additives with Drewplus TS-4481. This additive, by itself, gives a better and more effective protection against foaming, during manufacturing and application of the coating, than mixtures of additives that have previously been used. This regards both applications using a brush and high pressure airless applied systems. Drewplus TS-4481 is a formulation of silicas, paraffinic oils and silicon-derivates. According to the results, it is concluded that this additive is highly compatible with the specific coating studied in this thesis. The project was performed at Teknos AB which is located in Tranemo. The company belongs to one of the leading suppliers of coatings in the Nordic region called the Teknos Group. / Uppsatsnivå: C