Schaller paints with a beeswax-based paint mixed with pigment and kept molten while painting, this process is called encaustic. The word encaustic comes from the Greek meaning to "burn in", which refers to the process of fusing the paint. This type of painting was used in the 5th century B.C. for weathering boats and coloring marble. Encaustic is the most durable of the artist's paints because the beeswax is impervious to moisture.
The beauty in the paint is found in its immediate drying time. Because it cools immediately, the gesture and brush stroke are captured. This has been his preferred medium since 1997 to the present.