Woolsey Yacht Shield SF utilizes an enhanced formula with a high cuprous oxide load that's combined with PTFE for multi-season control in all types of fouling. It employs a unique controlled erosion technology to minimize coating buildup and keep underwater surfaces smooth. Its ablative surface wears away with use, providing a continuous supply of fresh biocides and eliminating the need for sanding. Woolsey's Yacht Shield SF formula allows the vessel to be hauled and relaunched without repainting. Excellent choice for power or sailboats with fiberglass, wood, or steel hulls.