Why is antifouling paint (pintura antiincrustante / patente) applied to the underwater hull of a sports vessel, and what precaution must be taken regarding sacrificial anodes and transducers?

1. To prevent growth of marine organisms (algae, barnacles); antifouling must NEVER be painted over zinc anodes or echo sounder transducer faces
2. To make the hull completely waterproof; it must be applied in a thick coat over all zinc anodes
3. To eliminate the need for lifejackets on board
4. To attract marine fish to the hull for coastal angling