If you really want to stop rust, you need to remove the rust from the frame and then coat it with some sort of rust ******ant. Frame Saver is meant to be applied to the inside of your frame tubes. It displaces moisture and probably slows down rust formation. Probably works fine if there is no rust inside to begin with, but if there is some you will only slow down the progression of rust. If you could clear the inside of the frame of rust (say by brushing it out), it would work really well.