Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.
UV paints are effective in any daylight. But early and late in the day, UV light penetrates the water’s surface much better than human-visible light. UV also penetrates fog and clouds. At these times, UV light is by far the greatest amount of light in water. Moonlight and starlight also contain energy from the UV spectrum.
