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Schematic illustration of the working mechanisms of a traditional polishing antifouling coating containing nonencapsulated CuPT crystals. Due to their low seawater solubility, partially dissolved CuPT crystals are present in the leached layer. Most organic biocide particles do not have sufficiently long seawater contact to fully dissolve and are consequently lost as crystals at the coating–seawater interface. Note that the sketch is not to scale.
