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eh, it's my understanding that the time to apply rust-proofing is before the rust starts. Suggest you will have to clean all the current rust before applying - and then the questions of how well the rust was removed will remain. Further suggest that applying rust-proofing over material already rusted will only accelerate the problem - perhaps mask it for a bit longer - but the rust will eventually show up bigger and badder than if left alone.
Rustproofing is ideally done when the vehicle is new. At this point, the idea would be to remove the existing rust and protect it from spreading. There are many after-market products for removing and protecting from rust. Good luck!
1996 F150 Scab longbed, 5.8L, 4x4, 31x10.5 tires, 187k miles and counting. step bars, low-profile tool box, Euro-clear turn signals & headlights, Euro taillights, vent visors, class III Reese hitch, Tekonsha brake controller.
"when you have a hammer in your hand, everything looks like a nail."