Quoted from EMsInKC:
I've been using Evaporust for years, I never have coated anything after using it, and the rust has never returned.
I really like using Evaporust to remove or convert the rust.
I have made the 4" pipe diameter dip container to handle 4 legs at once. I can also throw other nickel coated rusty parts in also as it is large enough unlike my first 3" pipe dip container as it was too small to add many odd shape parts into.
When emptying the 4" pipe you need to be careful not to spill the Evaporust as its a difficult shape to man handle. I now pour into a shallow container not onto the concrete floor. I am evolving.
However, I have not been so lucky with the rust always returning. How long do you leave it in the solution? I never leave more than a day maybe that's it, or possibly down here in south Texas its the humidity.
I usually add a coat of Minwax as minimum, poly clear coat or re-plate depending on my mood, what I can find handy or severity of the rust.