Prolly similar to a process used in aircraft called "flamespray". It'll prolly work OK if yer not trying to reconstruct a whole panel using it. grin Also keep in mind that the underlying problem of the rust needs to be addressed or it'll simply re-rust around your "fix".

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.