How much paint does it take to cover the outside surface of the United States' White House?

According to White House History, which was a publication issued twice each year from in 1997 until 2015 when it became a quarterly publication, the White House required approximately 570 gallons of paint to cover its outside surface when it was last painted.

It has been the practice from the mid-20th Century to repaint the White House every four years as part of the inaugural ceremonies. However, the progressive build-up of paint has made each successive layer less effective and more difficult to maintain. These days, the White House’s exterior is maintained with touch-ups as necessary. A full repainting has not taken since the last major painting of the White House’s exterior in 1989, after the existing 40-odd layers of paint had been stripped.

The above was noted in White House History, which is published by the White House Historical Association, a private, non-profit organization whose mission is to enhance the public's understanding, appreciation, and enjoyment of the White House. The White House is known as the official home and principal workplace of the President of the United States.

White House History features articles on the White House, typically relating to the house's use and life on the premises. White House History is not a political forum, although at times political history is within its subject matter.