I would use 16g 1100 Well I use 1050A which is the same as your 1100 I believe. This is what is used on cars like Aston Martin so good enough for anything. Weld with O/A, you don't need anything special I have used lots of torches and I have had no problem welding with any of them. Use a strip of the parent material as a filler rod (why would you use anything else?) You want to be able to dress the weld out so if the weld is made of the same material as the rest of the panel there will be no probelms.
Its not possible as far as I know to weld with propane.
I really recoment that you learn to gas weld ally its not too hard, it just takes practice.
David
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