there is no such thing as "converting " rust. you can use various chemicals to turn it black or purple even pink but it is still rust living in the metal . you can cover it up with any of the wonder snake oils but it is just covered. sooner or later all that will be left is the snake oil because the metal will still rust. one pin hole all the way through and you have a snug warm rust hotel .
if it was that wonderful you would see high end restoration shops swearing about it instead of swearing at it . your car, your choice .