Characteristics like density, particle size, flow, absorption capacity, wettability and adhesion may highly affect the processing itself and obviously many materials will be totally unsuitable for application in a rotary coating process. Another restriction is based upon the specific demands of each seed species and further limits the degrees of freedom with respect to the choice of materials. 

Like in traditional pelleting the behaviour of coating materials and the potential  interaction with process variables that may alter the final product properties (e.g. density, hardness, moisture uptake, splitting characteristics) will have to be defined. Case by case the most suitable coating formulations will need to be selected or when needed, will have to be developed.