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, you&';ll 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.