Just as a side line to what has been mentioned, Which is great advice.
make sure your welded area is the same thickness as your parent metal, or you are chasing your tail.
The area behind the panel needs to be flat and smooth as well as the surface. Even if its 0020" thicker it will have a dramatic effect on causing issues.
Good luck with it as there a bugger to chase out.
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John
EK Holden V8
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