When applying antifouling paint to the hull bottom, it is easy to overlook sensitive components such as fishfinder transducers or light fittings mounted below the waterline. These surfaces have different requirements than fiberglass or the metal of the underwater hull. A common mistake is coating the transducer with the same paint used on the hull, risking signal attenuation or interference. The same care must be given to underwater lights, where fouling buildup can overheat the lamp housing.
Formulations designed for these components are typically free of copper oxide or heavy metals that could cause galvanic corrosion or block sound emissions. These are silicone-based products or transparent formulations that create a smooth film that barnacles and algae find difficult to colonize. The right choice depends on the material of the lens or mounting, which is usually plastic, bronze, or stainless steel.
At Nautiba we verify that the product you choose is compatible with your specific equipment. We know that proper maintenance of these parts affects safety underway. Our technical experience always recommends a thorough cleaning before application: if the surface is not perfectly degreased, even the most effective antifouling will tend to peel off after just a few weeks in the water.
Before proceeding, check the specifications from your transducer manufacturer. Some manufacturers prohibit the use of solvents that could damage the gasket or lens. If you have any doubts about the compatibility between the type of paint and the plastic of your component, contact us for pre-sales technical support.
Tips for effective application
- Thoroughly clean the surface with a suitable solvent to remove all traces of grease or old paint before applying the antifouling.
- Apply the product in thin coats, following the drying instructions and avoiding runs that could compromise sonar beam precision.
- Do not use copper-based antifouling paints on bronze-body transducers unless explicitly stated by the manufacturer, to avoid galvanic corrosion.
- Make sure the outside temperature is within the parameters indicated on the packaging to ensure proper curing of the protective film.
Can standard antifouling paint be used on transducers?
No, standard hull antifouling often contains copper oxide, which can block the transducer's sound signals or cause corrosion on certain materials, as well as compromise the transparency of underwater lights.
How do you remove old antifouling from a transducer lens?
Removal must be done with extreme care. Use only soft cloths and solvents compatible with the transducer's plastic material, absolutely avoiding abrasive pads that would scratch the lens and degrade sonar image definition.
What happens if the transducer is covered with too many coats?
An excessively thick paint layer acts as a shield that attenuates the power of ultrasonic pulses, reducing the maximum range of the fishfinder and the clarity of bottom detail.
Do underwater lights require different protection than transducers?
Although the goal is the same, underwater lights generate heat. A product is needed that withstands thermal changes without yellowing, while ensuring the lamp's heat is properly dissipated into the water.
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