The National Park Service has a two level concrete parking structure at Yosemite National Park, which, because of salt and mineral leaching problems, people were reluctant to use.
Following rain or snow melt, white mineral deposits would appear on the ceiling of the lower level, and on any vehicles parked there. The Park Service purchased Seal-It Concrete Sealant in October of 1999; applied the sealant amidst skepticism, which has since disappeared (the skepticism, not the sealant). There are no signs of leaching salts or minerals, and people are happy to be able to park underneath again.
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