I have a tough time keeping the poly glue from "seeping" out during curing into the hinge line. I know the vaseline will protect the hinge but if it oozes out into the hinge line right at the base of the hinge line, you can't get the hinge not to have a "gap". Stuff is like plastic rock after it dries. Thats my biggest problem with it--maybe I'm missing another trick. [] You can clean up epoxy with alcohol before it sets. You can clean up the poly glue all day and stuff just keeps oozing and oozing. Maybe the trick is using only a tiny bit inside...but then your always wondering if you got enough and you don't have a weak hinge.