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I always weld the entire perimeter of the panel, a lot of people however just spot the panel and seal around it. It all depends on how comfortable you are with welding. I find that it is better to do the entire panel and not risk rust forming in the seam. If you make sure that there is no rust where the panels meet and do a good job sealing it, it should be fine. To avoid warping when doing the entire panel, i spot the perimeter and then fill in between the spots, i use a wet spong to keep the panel cool and move around the panel doing opposite sides so that any one spot doesn't get to hot.
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