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Hello all - working on a fiat 850 and all fiat jokes aside, I'm installing a patch panel on my quarter fender thanks to - you guessed it: some rust around the fender lip. The patch panel is a lot bigger than the rust areas, so I have an option of trimming the panel down. As it is now, it is the size of the red outline in the attached image, and goes across a body line (dashed lines). Sorry for my illustrating skills. Anyway, I could trim it so it doesn't go across the body line, like the black outline. What I'm after is trying not to warp the quarter fender as I'm no pro with the torch and shrinking metal. I've done plenty of sheetmetal welding and alrady know not to put to much heat into the panel but can't decide what would give me better chances here. Seems like cutting through the body line will make the whole thing weaker and more prone to warping, but not sure on this one. Thanks for any input...
 

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body lines actually help keep warpage contained. You'll be ok if you do one tack at a time staggering your tack location after each tack by at least a couple inches. The more inches away the better. I would stay away from the body line cause that's an area where the panel has to stay in a certain area to align. You take that out of the equation and you got more wiggle room. You can lay it on top and scribe. Just make sure the bad metal isn't stopping it from sucking up to the wheel house
 
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