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23rd June 2013, 03:04 PM #46Learning to make big bits of wood smaller......
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4th April 2018, 10:58 AM #47Intermediate Member
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I thought that the preferred method was to use phosphoric acid. Methods & results seem similar although I have never used citric acid in this way. The grey film left is iron phosphate which I understand to be itself "rust resistant". The car companies usually use this as part of their body treatment prior to painting. Tannic acid is sometimes used with phosphoric & leaves a brown finish, the tannins are said to increase further rust resistance.
I usually apply lanolin after the final wash & dry, available in a spay bottle, a little goes along way. Of course if you need to use your tools regularly, this is not ideal, maybe a light oil wipe in that curcumstance?
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