From go.com:

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In addition, Imagineers developed a new technology for use in their designs of the Finding Nemo Submarine Voyage. Since chlorinated water causes the colors of paints to fade quickly, Imagineers were challenged to find a product that produces brilliant colors while complying with environmental standards. As a result, Imagineers invented their own method of painting scenery with recycled glass. More specifically, recycled glass bottles were broken down and recomposed into glass pieces, which were then crushed and applied onto the surface of the submarine tank using a zero-percent volatile organic compound epoxy. To date, Imagineers have created 45 custom colors and used nearly 30 tons of recycled glass in the design of the lagoon.

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