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Hello, while in the midst of some electrical repairs I figured while I'm at it why not redo my interior. I'm almost done cleaning/grinding all of the tar and now its time for rust repair. I've been have been debating whether to weld in patches or put in new floors all together. However, given that I want to finish this relatively quickly and that this is my first welding project,patching with 18 gauge sheet metal seems like an acceptable approach. The smaller patches are straightforward, where I need advice is with the floor pan seams and seat brackets (pictures below): 1. Both the front and rear seams are rusted out. What is the best approach to repair these areas? Can I just cut 2 or 3 inches on either side of the seam and lap weld in a single patch panel? Or do I need to do two separate repairs e.g. cut and butt weld in upper patch onto the firewall, and then cut and weld an overlapping patch that is attached to the old floor pan? 2. The seat bracket seams are rusting out, should I completely remove (or cut) the brackets out and clean up the areas underneath or can I get away with spot blasting the seams and treating with phosphoric acid?