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In freshwater, the aging rate of coatings may be faster due to the fluidity and temperature changes of the water body. Especially for self-polishing coatings, the wear rate of coatings will be faster in freshwater environments with faster water flow, resulting in premature attenuation of antifouling effects.

Antifouling paint is a type of paint used on the surface of ships to prevent marine organisms (such as algae, shellfish, snails, etc.) from adhering to the surface of the hull. These coatings can significantly improve the navigation performance of the hull, reduce fuel consumption, extend the life of the ship, and reduce the negative impact of ships on the environment.

The color change usually means that the coating has undergone a chemical reaction and may be a sign of aging. The change in color does not necessarily affect the antifouling effect immediately, but if the color of the coating is found to be significantly faded or uneven, it may be that the coating has been damaged and the antifouling effect has begun to decline.