Thanks, Albert; that looks like what I need.
Musical Therapy's idea idea of using shoe polish is clever, cheap, and would work for natural wood finishes, but in this case I need to rebuild the hard plastic layer on top of the fiberboard.
Musical Therapy's idea idea of using shoe polish is clever, cheap, and would work for natural wood finishes, but in this case I need to rebuild the hard plastic layer on top of the fiberboard.