O completely stain the bottom rectangular prism, Seth had to cover 1050 square inches of wood. For one of the cubes to be completely stained, he had to cover 16 square inches of wood. To completely stain the top rectangular prism, he had to cover 180 square inches of wood. Once the stool was fastened together, he applied a coat of sealant to all exposed surfaces of the stool, including the bottom, to cover a total of square inches.