Just a quick comment on the poly glue, only the outside surface is hard after curing. The interior is more air than glue and cuts/sands easily. It is fairly easy to cut the majority of any "oops" off with a xacto or razor blade. I have also notice the actual grip on typical plastic covering material is not all that strong. You can sometimes carefully get a knife blade or fingernail under one edge and simply peal the mess off without tearing the covering. You may not get all of a "oops" completly cleaned off your work, but you can certainly free up hinge points and surface to the extent that they will function properly.