As I general rule I only 'reduce' the welds where the panels will touch them. Do not grind the weld completely flush with the surface of the tube leave it about 0.5mm proud otherwise you might just have not bothered to weld it. If your going to be using stickaflex to bond your body panels on you should end up with a layer 0.5-1mm thick any way so the reduced welds should not cause a problem.
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