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lower the heat on the welder increase wire speed just a little and used the smallest wire gage you can with your welder .023 .
if you can flatten out a piece of copper tubing at the end and get it up behind the blow out for a backer when you weld it will work .
if not just little welds at the edge of the blow out until it's filled in works .
you also have to weld all the sharp edges were you missed or the body filler will shrink in there too .
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