Hi TC,
I understand that it's for rust removal as that's all that I've used it for as well, but any process where electricity flows through a solution via a piece of metal will suffer from Hydrogen Embrittlement and as such requires to be heat treated (stress relieved) so that the metal returns back to it's pre treated state.
Yes sadly Kermit Green and Rover Red finishes are all powder coated and not painted.
Cheers,
BB.