I would say weld it! Welding (as long as it is done right and not rushed) will not risk cracking later. And don't weld and use hot water like someone was saying your warpage will be way worse not to mention change the properties of your metal, also when mig welding (body stuff) use a wire that is less than a .035 wire or else the body metal will tend to want to burn more than the actual wire itself. Just take your time and use superior products; after welded clean up good with a flap wheel not grinding too much of your metal away and then first use a fiberglass based filler and then work your way up to a glazing filler.
Better to just work your way side to side on a panel welding maybe like and inch on each and then just walk away for 5 minutes and naturally. Water might work if it was extremely warm water but it would be like putting cold water in a boiling hot pan you could easily warp!
well you never cleared up that a shop is doing the work,panel bond when applied correctly is like welding, the cost is going to be the same no difference,
and i replied as a professional and gave my yrs of advice, so sorry if i typed it incorrectly for ya i dont give the "normal" answers i give the correct answers
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