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It's some sort of rust preventative, possibly fish oil, fish oil will evetually set like varnish (it can take several weeks to set in warm weather) but while tacky can be cleaned off using white spirit, or possibly grease remover. caustic soda solution will remove it too. caustic soda relatively cheap, not technically toxic, but is very corrosive and a ...


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Slow... but low toxicity Leave the pipe outside until it's nice and rusty. Then remove the rust by electrolysis (washing soda or baking soda in water work for an electrolyte.) This happens to leave a pretty grayish "clean" surface, IF you rinse with hot water and immediately dry it (leave it sitting around wet and it will re-rust.) It's possible that you ...


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It is "mill varnish" , nothing to do with mill scale. I find no definition in the ASTM index. Very likely it is a varnish ; A resin plus a solvent/vehicle. Mineral spirits or gasoline should take it off. Different mills may use different products as there is no firm definition. It is applied to new , relatively scale free pipe. A industrial purchaser does ...


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Mill scale is the iron interacting with air while the metal is very hot. It's almost one and the same as the surface rather than a coating on it. The problem is removing it without removing the steel underneath Grinding with a different disks will work, as will a steel brush, or sandpaper. The easiest is probably using muriatic acid. It's cheap at about $...


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