I took the fender back to my friend that does oxy acetylene welding and had him weld the seams together. This time the backing material helped to prevent him from burning through.
Normally he would be able to flow the metal together similar to how solder flows out, but I told him that I had no concern for how ugly the weld might get as long as everything stuck. I have no problem with grinding it smooth.
Here it is after welding.
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And the final result after grinding and primer. I'm happy.
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Yes they are! They are original and very hard to find so I'm trying my best to salvage them. This is a patina restoration but the fenders are way past the target (which is the original tank). So I'm working in two directions! The bare metal parts have fresh paint that needs to look old and these fenders are crusty and need to look better!
I wish that I could've started in the first month of the build-off. Two months is really pushing me!