Last weeks job was to crawl back under "The Juice" to work on the floor pan. Not the most fun thing job on an old car, but this one was not really that bad. There was a lot of trans fluid and fine Ky. soil under there but no rust other than a bit of surface rust. The factory undercoat was in good shape, tough as nails, and I saw no reason to remove it.
I degreased and scuffed the floor, then applied Oshpo and let it work overnight. I then put on a good coat of Rust Encapslulator and finally the undercoating.
I still need to add another coat of undercoat to match up better to the factory applied stuff. I wanted to use undercoat on the bottom side for it's sound deadening.