I have two new patches welded from the inside of the car. I overlapped the patch panels and the existing metal by 3/4" to 1". My plan is to tack weld a few spots on the underside of the car, use seam sealer to protect the seam, then paint. Any suggestionns, constructive critisim, pictures of what has worked for you in the past would be appreciated. I'm looking for what would be acceptable to see, from the underside of the car, when I am finished. Thanks.