The skill of professional tradespersons and the use of professional products are vital in historic preservation and restoration projects. The Standards for Preservation by the U.S. National Park Service include, "Chemical or physical treatments, if appropriate, will be undertaken using the gentlest means possible. Treatments that cause damage to historic materials will not be used."
In the past, harmful coatings such as paraffin wax were used to preserve historic buildings. In time, the coatings built up a thick layer, giving the natural stone a yellow-ish glow on interior stone and a black-ish film on exterior stones. Not only was the color altered, but on exterior applications, the wax contributed to the breakdown of the natural stone's strength because moisture was trapped behind the thick coated layers.
PROSOCO's Sure Klean® Restoration Cleaner was used by professionals to gently cleanse the grime-infested paraffin wax coating off the exterior of the 1846 Trinity Church in New York City. Later, PROSOCO's Conservare H and OH Stone Strengtheners were applied to prevent any additional stone crumbling damage. For the Great Hall of the Library of Congress, PROSOCO's Sure Klean Liquid Marble Cleaner was used to gently clean accumulated smoke and pollutants from the building's original HVAC system on stairways, wainscoting, statuary and floors.
Epoxies with powdered colors to match natural stone are commonly used in a variety of stone restoration techniques. Until recently, large cracks on exterior stone cooktops or grills were repaired with polyesters and epoxies that discolor over time under UV penetration. New to the market is Bonstone's Last Patch Gel, a UV-stable epoxy product that can be used to patch exterior natural stones such as granite, marble, travertine and limestone. An instructional video is available on the company's Web site.
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