ECO HRT Black Aerosol paint. This ECO HRT copper-free antifouling uses the latest technology available to create a hybrid paint film strong enough to handle the tough marine environment without building up over time. ECO HRT, smooth durable paint surface wears away over time, eliminating paint film build up and the need for sanding. This copper-free formula can be safely applied to all aluminum-hulled boats. It provides excellent antifouling protection and can be hauled and re-launched without any loss of effectiveness.