Elmer's glue (as with almost all white glues) are PVA glue. The only difference is the amount of water in the bottle, hence the price difference. They are all water based. So, if you have a sticking problem, apply a few drops of water. This will soften the glue and the pin will release. This is the same reason you should not use these glues on projects that will get wet - the glue will release as it gets wet. (FYI - Mod Podge is simply the same pva glue with a gel component that allows for a more even spread.) Those of us who build items (terrain, fairy houses, etc) buy basic jugs of PVA dirt cheap and then water it down to whatever level we need to use it.