Jotun Mare Nostrum SP (self-polishing) antifouling in black is based on special binders, assuring a completely active surface, which is continuously renewed providing a clean hull for the whole season. This 2.5 litre Jotun antifoul is suitable for all kinds of boats, providing very good fouling protection. After immersion in water the true colour will appear. Recommended use: - This antifouling is not recommended for boats that only sail in fresh water. - Only White colour (5-83020/2.5) is recommended for Aluminium hulls when used as part of an approved system. Mare Nostrum SP can be applied using: Roller: Recommended. Care must be taken to achieve the specified dry film thickness. Brush: May be used. Care must be taken to achieve the specified dry film thickness. Spray: Use air spray or airless spray.