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Well, on the subject of the whole debate....I use boiled water. Always have, always will.
But I have this little wonder to help me out, too. I'm able to do precise heating, be it a small joint, or stick the little tube in a crack and spritz that shit with hot water. Works super well. I also use it to get elmer's glue into tight spots (hinge joints, etc) to tighten up joints if need be. Again, the tiny tip helps.