I always glue my miniatures to a plastic wine cork with hot glue, like so...

..to get a good hold when I paint them. The bond between cork and base has always been firm enough to last for a certain amount of manhandling and soft enough for a stout blade to part when the mini is done. However, I got a new bag of what I thought was generic glue sticks some time ago and the bond these create are just a bastard to cut apart. With the amount of force I need to apply I am bound to ruin a miniature some day.
Does anyone know of a way to dissolve hot glue bar using heat, which obviously would ruin the paint job to?