So I removed the vinyle top on my 72 dart swinger, the rest of the body is rust free but not the roof, there are a few pinholes rusted through and a lot of pitting. is there any way to save this by grinding all the rust off and patching, or am i screwed, i was told even if i get all the rust off and prime and paint it it will bubble up in a few years under the paint. Just wanted some step by steps from people who have experience with this, or am i better off doing what i can and putting a new vinyle top back on.