You could also use pro bond (or any other poly-based adhesive). I've found its foaming qualities effectively surround the barbs of the hinge and fills any voids in the foam. Coat the pivot point with vasoline to avoid glue seepage and tape the hinges down so the drying glue doesn't push them out. I fill the hole with the glue then dip the hinge in water before inserting it into the surface (pro-bond takes on water as it dries). I've never had a problem!