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Maybe I will be accused of heresy, but if you just can't or won't weld up the holes, sand the backside of the repair first, then fix the frontside beginning with something like Duraglass or Everglass. Once the repair is complete, return to the backside and sand it again, knocking down the 'worms' that have formed. Apply a coating that will prevent moisture from entering through the holes, primer and paint would be good, or even undercoating would be acceptable. Whatever you do, getting a good coating on the back of the repair is a critical element, no matter what repair procedure is used!
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