Hello,
I consider sensitive cleaning and preservation as crucial in cold arms collecting, nevertheless I am not experienced too much and I would like to learn as much as possible. Until now I was informed WD 40 could be sometimes too much agresive (continuing to dissolve deep rust even after the finished preservation) in comparision with other oils like e.g. Konkord.
As far as after aclening preservation is concerned, when I discussed with "museum people", they recommend in certain cases tanin (even if the iron is clened up after this tanating), and for finshing special silicon oil or restoration wax... If I may ask - olive oil is traditional preservation surfactant ?
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