The initial charging, or method in which fluid and powder are combined prior to final mixing in a Resonant Acoustic Mixer (RAM), is critical to the quality of the final mixer. In this study, the mixing performance of a RAM was examined through an experimental study on the initial charging of the fluid and powder. The first part of the study summarizes the determination of wicking behavior through experimentation of two initial charging methods: (1) dispensing fluid onto the surface of the powder to be absorbed by the capillary pressure of the open pores and (2) dispensing fluid within the powder to radially wick nearby regions through capillary pressure and feed-induced pressure. Experimentation was carried out for several mixtures of powder (with varying particle size and surface topography) and fluid (with varying volumes and viscosities). The second part of the study outlines the mixing performance of the RAM using distinct dyed fluid and powder combinations initially charged within the powder. The volumes and viscosity of fluid became the process parameters for the RAM mixtures. The mix-quality was determined by the uniformity of the color variation within the mixed batches. The results highlight the effect viscosity has on improving the mixing performance of a RAM.