Antifouling coatings for aluminium vessels have been a controversial subject for many years and for many years the use of organo-tin based coatings was seen as the most effective long term option. Organo-tin products are no longer an option and this has resulted in evaluation of alternatives. Traditionally the use of copper based products (Cuprous Oxide mostly) had been an effective option for steel hulls but were avoided for aluminium due to concerns with the interaction between the Cuprous Oxide and aluminium hull.