Judicious use of a heat gun will aid you immensely. If it is a matter of separating two objects stuck togethr, the best method I've found is (if possible) to use the finest gauge piano wire as a "garotte" and pull it throuh the joint. Generally , attempts to pry pieces apart will mean the ultimate destruction of at least one of the pieces! On refabrication, in most cases, I've found 4200 to be a more agreeable solution that "kicks" faster and has ample holding power. Good luck!