For removing old paint on wood I use a burner. From iron, I have found the quickest and most effectual way is to dissolve as much sal soda in warm water as the water will take up, and mix with fresh lime, making a thick mortar; spread this on the tank, about an inch thick, with a trowel; when it begins to crack, which will be in a few minutes, it has softened the paint enough, so that with a wide putty knife you can take it all off; then wash off tank with water. This takes off paint, rust, and everything, including the skin from your hands, if you are not careful. Plaster one side of tank, and use mortar over again for the other side.
Engine oil used to brighten smoke stacks, no matter with what painted, will cause blistering. Tallow and "japan drop black" mixed, and apply while stack is hot, with an occasional rubbing over with the same, will remain bright a long time.

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