Hi Vince,
In the 'picture hanger department ' of Home Depot or Lowes there is removeable picture hanger material that comes in a celephane pack that looks and feels like silly putty. It is blue. It comes in squares. It is sticky but no residue. Roll it into long skinny worms about a 1/4 inch thick. Take thin poster paper, cut out camo designs, place on plane, put the sticky blue stuff under it about 1/4 inch from edge, press down then spray. You have soft edge!