International Ultra 300 Antifouling Paint - 750mlInternational Ultra 300 Antifouling Paint 750ml Ultra 300 from International is a premium hard antifouling effective against fouling organisms. It is suitable for professional and consumer application onto vessels in fresh and salt water, and particularly suited to fast powerboats or any streamlined yacht. The antifouling's hard scrubable finish provides protection for up to one year. Ultra 300 is suitable for burnishing to provide a smoother finish