help with rust

[gav555666]

i got bit of rust in the vs mostly surface behind the tail lights n under the rear
does anyone know the best way to get rid of it ?
ive cut out a bit and welded in some new steel,but dont reckon its enough.
would getting it rust guarded now stop more from forming anywhere else?
thanks
gav

[chrisdoesitbetter]

i think there is some rust converter stuff you can get, depending of the severity of the rust and location, i would have sanded it back to clean metal, bog if necessary and primed and resprayed it...