When I lived in VT, vehicles had to pass a yearly safety inspection. I had a FWD VW Rabbit pickup truck that I had built out as a micro camper with an elevated bed in back and a flush mount shell with rear window removed for crawl through (this was possible due to cab/bed unibody construction). I had used extra heavy chains on the front tires and centrifugal force had thrown them outward enough to rip the edges of the fenders into shrapnel. Approximately every 2 inches there was a ragged tear in the sheet metal extending upwards about 2 inches.
The inspectors told me I would have to replace the fenders and return for re-inspection. I went very slowly with a hacksaw and cut a new edge just above the highest tear in each fender, filed, sanded, painted with touch-up paint, went for the re-inspection, and passed. You couldn't tell the job had been done unless you looked at it up close and very carefully with an idea of what you were looking for. The inspector had no clue there ever had been more fender there.
This was single wall construction so I did not have the issue of sealing a seam.