Prior to redoing the carpet on my '86, I removed the seat and old carpeting......and a ton of old glue. I found a patch of rust on both sides of the hump. Maybe the size of a dinner plate. It wasn't scaling or loose but I figured to address it before the carpet. I took a wire wheel to the floor, vacuumed it and then washed it down with lacquer thinner. I bought some brush on stuff from Eastwood called Rust Encapsulator and put it on pretty heavy all over the floor, actually two coats. I had also purchased some Flex Seal ( the TV stuff advertised) for another project and I put a coat down on the floors. It goes on like thick black paint and has a rubbery feel to it when it dries. The stuff from Eastwood was around $35.00 for a pint but I don't remember what the Flex Seal cost. Maybe an expensive way to address rust but I'm very confident it'll hold up well.