Sea~Barrier Altra is a new, patented silyl acrylate polymer based antifouling designed to protect hulls from marine growth through an outstanding controlled self polishing hydrolysis action - the silyl acrylate, cuprous oxide and co-biocide combination provides exceptional multi-season protection. Extensive testing and sea trials show Sea~Barrier Altra to be providing exceptionally cost effective, long term protection for commercial & deep water use. Ideal for work vessels of virtually any description such as fishing fleets, tugs and barges, container ships, passenger and vehicle ferries, and vessels trading in deep sea or coastal waters.