[Spridgets] Rust (Pardon if I digress to LEC stuff)

[Robert Bruce Evans]

If I may go off-current topic for a moment with an LEC problem/question, I have some parts and some tools from which I need to remove rust;  some of it bad, some not-so-bad.   Some of them have "interiors" that do not lend themselves to sandblasting.  I have in my "tech tip" file an electrolytic rust removal process that I have used successfully in the past (including parts in a 55 gallon plastic barrel).
My problem:  I do not know from whom I picked up this tip, and I do not remember how to prevent the quick "re-rusting" that takes place so quickly.  I know that I used a spray of some kind, but I don't remember what it is.
Can anybody help?
Buster Evans