These two heater exchangers are the sames ones. However, unlike in photo #1 the same area that was wire wheeled has now been blasted in our blast cabinet. The result is striking as far as how more efficient it is to bead blast a substrate than to just wire wheel to sand it. In this photo we can clearly see crevice corrosion starting up at the top right edge of the cooler. Furthermore, the red areas are very apparent. These red areas are unhealthy so to speak, as these areas of the bronze are in an advanced state of galvanic corrosion.