Hard matrix antifouling suitable to protect both sailing and motor boats. It can be used both in fresh and salt water. The controlled release of active components achieves a good antifouling function, which on fast boats, is renewed by the friction of water on the hull. It is suitable for the protection of fibreglass and composite materials, wood, steel hulls. The white version of this product is usable on aluminium and its alloys, while the coloured versions are not compatible with these substrates.