OK 2001 aero wagon and it has rust right behind rear doors at the very bottom just above trim, going to have this professionally repaired, what I am wondering though is that under the car there are a few seams that run the length of the car which have a rubber membrane over them, the problem is that along the edge of the seams rust has started to form, I am wondering how to stop this. I was going to get it undercoated but would think I should deal with it first. Any thoughts? Grind it down? hit it with converter? just not to sure how much may be under the rubber coating ?
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