the trick is to use a rotray grinder, i use an angle grinder... use a grit paper that isnt too fine minimum 80...i use 24 first and touch it over to rough finish with 80-120 , and lay it FLAT on the panel (sparke will fly from the entire perimeter, not just in one direction).... then move the grinder back and forth over the weld and it will be flat before you know it... (if you dont lay it flat on the panel, the weld will not be smooth with the surface !)
smooth the metal with a DA afterwards
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Elwood:We're 105 miles from Chicago, we have a full tank of gas, half pack of cigarettes, it's dark out and we're wearing sunglasses.
Jake: Hit it.
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