Was thinking about buying a few cans of this waxoyl stuff. I like the idea of no rust but seems a little good to be true? Typical fiesta is showing some rust on the arches now, I've cleaned it up and am going to paint it once again but if I bought some waxoyl would it prevent the rust coming back? I also had to have some welding done on the chassis for previous MOT and been looking at quotes for getting the whole thing waxoyled but if it's not worth it no point. What you guys reckon?