Engineering360: "Scientists develop degradable coatings for paper food packaging"

It is my understanding that the challenges for paper stock is both the penetration through the surface where extruded polyethylene and also fluorochemicals have been the best options of moisture, oil and grease resistance but also the wicking on the cut edge of the cup stock material which must be wrapped and then glued to form a cup (also potential issues at the bottom) and surface coatings do not provide perfect protection for the cut edge.....how is that issue being addressed?