I recently found a really nice steel relic and wanted to clean and preserve it in a professional manner. I slow cooked it in my electrolysis machine, followed by judicious use of nylon and brass brushes. I then coated all of the iron with a product called "k-phos" It is available from KG Coatings Inc. This stuff is incredible! I don't sell it, but after seeing what it can do for the past few years, I will defenitely reccomend it! We have a cast Iron shoescraper in our yard that I dug several years ago. I sandblasted and coated it with K-phos. 12 years now in the weather with NO rust AT ALL!!