Education... photographic identification of electrolysis.
Fit the SeaBis System - its the most economic way for you to protect your installation.
Radar.
The installer had not followed the manufacturers direction, correctly. With the elimination of electrolysis, from the radar, the radar display had less (electronic) noise, better definition and increased range.
Note:
This problem is very common. Electrolysis is removing particles of metal under the paint. That results in the paint lifting.