Sharkbite Barnacke Remover is one of the sharpest worm away holders on the market! Can be used on the engine, hull and propeller. Easy to use, efficient, powerful spray. A lime-solver makes it easy to remove the shells and barnacles on the train, boat hulls, trim tabs, etc. without damaging adjacent surfaces. Can be used on lacquered or painted surfaces, aluminum, steel, all gelcoat, fiberglass, plastic and teak. Meanwhile Sharkbite much more user friendly than many others because it does not contain hydrochloric acid. Not sensitive to frost. Biodegradable. 500 ml spray bottle.