Underwater Light Coating (ULC) 70mlKeep Your Lights Bright and Clean. PropOne ULC is an optically clear, foul-release coating that prevents organisms from adhering strongly to underwater light lenses.With minimal maintenance and a simple, one-coat application process, youll spend less time cleaning your lights and more time enjoying them.The ULC can be applied to glass and polyamide lenses as well as surrounding brass and plastic/composite light fittings. When not in use, the surface will become colonized by encrusting organisms, but they can be easily removed by cleaning with a soft sponge or wiping with a gloved hand.The ULC does not chemically poison the environment to prevent marine growth.