Swix Roto Brush Merino Wool 100mmA new and revolutionary way of applying waxes without the need of a waxing iron. The method is tailor made for harder waxes, such as the Marathons and is applied onto the skis in two simple steps: Start by applying the wax to the roto brush by touching the wax to the wool for a few seconds while running the drill at a speed of approx. 1. 500 RPM. Then, use the roto brush on the base with a speed of approx. 1. 500 RPM. Use light pressure. Start from