High copper load (40%) combined with Irgarol to offer outstanding dual biocide, multi-season control in all types of fouling. Ablative surface minimizes coating buildup to keep underwater surfaces smooth, while providing a continuous supply of fresh biocides. Can be hauled and relaunched without repainting. Formerly sold as Ultima SR and Horizons Pro, this formula has a proven track record as one of America's premium ablative bottom paints. Use with thinner 120.