In the early 70's I was given a test kit for Tectyl. It was made by Ashland Oil part of Valvoline. The guy gave me test metals. One bare and one coated with their product. I was instructed to sit them outside for 2 weeks. Of course the bare metal rusted and the coated sample did not. After 2 weeks he I was instructed to scrape off an area of the coated piece and put it back outside. The area I scraped off never did rust. The claim was that the product penetrated the metal. It sure seemed to. The Ashland Oil rep. mixed up a case in aerosol cans to match my silver 68 RR at the time and gave it to me. As a daily driver in Pa. winters it never did rust where it was applied. He said that Tectyl is chemical name of what was marketed as Ziebart. I recently had a 69 RR that had a very rusty trunk floor, upon removing it I could still see and smell the Ziebart in the frame rails. They were still perfect. I cannot offer any advice on how to remove it if it did penetrate the metal.