That being said; I've been trying to figure out the proper recipe for rust proofing/eating solution from tannins.
I've tried black tea, the tannin bought from Amazon, and gone as far as making my own solution out of oak bark and/or leaves.
I want to rust proof my truck and other equipment, but all the info I've found doesn't actually produce a viable solution.
Note; I have only used distilled water as required.