Applying Paint to Exterior Siding and Confirming Functionality

What happens here

The painter moves to a section of white exterior vertical siding. He begins to apply paint to the siding with the continuous-feed brush, moving the brush in vertical strokes along the planks. As he paints, some paint splatters or drips onto his arm. He reacts to this, indicating it might be an unexpected spray or a minor spill, then confirms, 'It works!' while looking at the tool and the painted surface. This indicates that despite the small mishap, the system is indeed functioning and delivering paint.

Goal: Demonstrate the tool's application on vertical exterior siding and verify its operational status.