A method of densifying a surface of a powder metallurgy article and an apparatus for the same are provided. A powder metallurgy blank is fixed in position in a fixture for being subjected to a surface treatment that employs an actuating member to exert to a pre-selected surface of the powder metallurgy blank simultaneously a spinning force and a vertically pressing force. The pre-selected surface can thus be densified to have sufficient wear resistance due to the application of the bi-directional forces.