Starting on a rusty 7x57 barrel tonight, will see how it goes. I have cleaned the barrel mechanically previously, will see what this potion delivers.

Posted by: @treeman

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It works at least as well as evaporust for a tiny fraction of the cost and seems to keep working for longer. For the ease of sourcing the ingredients, their cost and its efficacy I imagine it would be very difficult to beat

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I am making some tonight, what is its shelf life ? I assume very, very long.

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Only got to this now, so no results yet.

 

 

 

Far right was in solution, to left middle got wet, far left did not touch solution.
[url= https://live.staticflickr.com/65535/55316911222_c16578542e_b.jp g" target="_blank">https://live.staticflickr.com/65535/55316911222_c16578542e_b.jp g"/> [/img][/url][url= https://flic.kr/p/2shaCuE ]rust[/url] by [url= https://www.flickr.com/photos/204555085@N07/ ]frank allen[/url], on Flickr

We used a similar substance in the navy. Citric acid main additive (we would steal some and mix with castor sugar stolen from mess and Eno's from Medics and make a adult sherbet), plus what I was told was Caustic Soda and soap.
This was made by the barrel and applied with a mop to rusted areas that were going to be repainted, re-greased. It was a flood on, HP hosed off some time later approach. 
I wonder if it was same formula or another approach to same result.

Not sure about that. The acid used on rusty surfaces is phosphoric acid. It converts iron oxide to iron phosphate which is inert. Navy and merchant navy uses it by the drum. Colloquially known as "Meggie" by Cape crew. Iron phosphate is white, which works wonders for rust marks on white surfaces. Cheap as chips, so no idea why anyone in the navy would mix other stuff that is more expensive.

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