Abstract: A finishing board provides a smooth finish and removes air pockets during the application of wall coverings. A substantially rectangular plastic board has four rounded edges, four rounded corners, and a thickness of approximately 1/8 of an inch. A first edge is configured to contact a wall covering and measures either about 8 inches in a first embodiment or 12 inches in a second embodiment. A second edge is situated parallel to the first edge and also measures either about 8 inches in the first embodiment or about 12 inches in the second embodiment. A third edge connects and is orthogonal to the first and second edges. The third edge measures about 5 inches. A fourth edge is situated parallel to the third edge and connects the first and second edges. The fourth edge also measures about 5 inches. All of the edges are rounded to exhibit a 1/16 inch radius. Moreover, all of the corners are rounded to exhibit an 1/8 inch radius.