Auto body repair & detailing: Very Bad rust damage on roof of 67, rust damage, permenent

Question
I have lots of rust damage on the top of the roof of my 67 Plymouth. The rust has eaten through the metal on the edges around the windshields and in spots on the top of the roof. Prior owner used bondo to repair but it is chipping off. How should I go about repairing the roof.

Answer
In ordewr to do a proper repair that will vbe a permenent fix to the problem since rust is like cancer is to rplace the metal. You can try sandblasting and then coating with an epoxy primer, but you can truely never get rid of rust unless you remove it.