A TBT free controlled depletion polymer (CDP) antifouling which releases biocide at a controlled, consistent rate continuously allowing a fresh active antifouling surface; Interspeed 6345 provides up to 24 months in-service period with optimum antifouling performance for selected vessel types in seawater, brackish, and freshwater conditions in local coastal trades. With proven CDP technology, Interspeed 6345 possesses a surface tolerance in durable films, providing not only surface preparation cost savings, but also optimum endurance of mechanical damages in coastal ships e.g., tugs and barges, which are frequently alongside at quayside or other ships.