I accidentally used Hornady One Shot "Gun Cleaner" INSTEAD of One Shot "Case Lube" as a release agent on a Kimber 84M Montana. The JB Weld stuck to the metal very well despite the coating of Gun Cleaner. I eventually destroyed the stock trying to get it off. I had to buy a new stock and it took a while to get the epoxy off of the metal. The Case Lube works well but I now prefer car wax.
Sorry to hear about your mishap. For future reference, if you get epoxy bonded to metal put the entire gun in an upright freezer overnight. The metal will shrink, the epoxy won't and the bond will break.
I once bought a gun somebody had bedded without using any release agent and managed to break it free this way.