Need some help from a rust guru!

My Dart had a few long-term rust issues, and then it sat out in the weather for a year or two before I got it. Luckily, I bought it and put it inside before the rust situation got too bad. Sorry ahead of time for not knowing the right terms for body parts, I have zero experience with body work.

I figure I will have to replace both of the rear quarters at the marker lights, the left is shot for sure, and the right doesn't look very good.

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I will be placing an order with AMD for repair patches, so the shopping list is for quarter patch panels so far. I need help deciding if I need to replace the rear of the front fenders, right in front of the doors. There was a ton of pine needles behind this area, sitting there all wet and soggy forever. I got the mess cleaned out and don't see horrible rust looking in there with a strong flashlight. This is the passenger side, it has a few bubbles on the outside but it looks pretty minor.

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Here is the driver's side, it looks worse with some fair sized bubbling.

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The trunk pan looks good from above. Lots of surface rust but it will clean up OK. What's weird is this shot of the trunk from below. It's like the area delaminated, and half the thickness of the pan rusted and came loose, but the rest of the pan thickness is solid. Can this be cleaned up and maybe filled with JB Weld to give it some strength? It doesn't look like I need to replace the pan.

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Any insight into fixing this stuff and stopping any rust cancer is appreciated. I'm holding off with my AMD order until I can get feedback on other parts I might need.

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I think step one should be hitting all your area’s of concern with the grinding disc/wheel of your choice to get a good assessment on the rusted areas. Just finished some work on my rocker panels and the work needed became pretty evident once I got down to bare metal on the affected areas. Once you have a good look then you can decide on cutting, spot weld removal, ect.