In late 1959 through 1960, the Capitol Dome underwent a significant repair and restoration effort and at the end of 1959 the exterior of the Dome was surrounded by scaffold.
During the work, workmen using special pneumatic hammers removed paint from the iron, which was then sandblasted. Since bare iron rusts quickly it had to be treated with a red protective rust inhibiting coating within five hours of paint removal. Corroded and cracked metal was repaired or replaced where necessary, loose bolts were tightened, and missing bolts replaced. New bronze window frames were installed in the tholus and the interior bracing in the Statue of Freedom was reinforced. Repairs were made to the drainage system and flashing, and the Dome was completely inspected and repaired using stainless tell wherever extra strength was needed. The work also put in additional lightning and bird protection.
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