Luke Messick applies a clear coat spray to a safe at the Champion Safe Co. manufacturing facility in Provo, Utah, U.S., on Wednesday, Feb. 22, 2012. Champion Safe Co. specializes in making heavy duty safes for storing firearms. Photographer: George Frey/Bloomberg via Getty Images
Bloomberg Luke Messick applies a clear coat spray to a safe at the Champion Safe Co. manufacturing facility in Provo, Utah, U.S., on Wednesday, Feb. 22, 2012. Champion Safe Co. specializes in making heavy duty safes for storing firearms. Photographer: George Frey/Bloomberg via Getty Images

CristalACTiV PC-S7 is a photocatalytic, titanium dioxide product that breaks down harmful pollutants and produces depolluting and self-cleaning surfaces. It can be applied as a top-coat treatment on a wide range of surfaces, but it is primarily designed for exposed or untreated concrete. The ready-to-use product can be sprayed directly onto the surface, and does not alter the surface’s appearance. Cristal www.cristalactiv.com [Greenbuild Booth 2549]