Waxing prints is an old process. I use to do it, as did many others, to help hide the retouching on prints, particularly where there were areas which had black flecks lifted out, and/or the spotting colors were more dull than the rest of the print surface.
I still have a bar of Dorland's Print Wax but have not used it in years. Wax puts a nice sheen on the image, but I would never do it to a platinum print as I think it would destroy the feel of the print. It probably would cause the print to appear slightly sharper.