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Once everything is fitted, it all comes apart and spot-weld holes are punched in with a pneumatic panel flanger (top) and crimper. Once the spot-weld holes are made, everything is clamped and screwed back in place, and the spot-welding begins. Here, you can see Mike using a bar to press the flange of the new lower valance against the old one. Mike uses a layer of seam sealer between the two panels to keep the moisture out and inhibit rust. After the car is painted, everything will be sealed.