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I looked into this several years ago when I was going to repair a crack in a 928 fender (in the end I found a replacement fender), the tips I remember from asking were to be sure to get the right alloy for the job (would have been more critical on the thin fender), get a liner designed for alum. (Teflon I think) , alos I think I remember that Alum. welds better with the welders polarity reversed(?).
The reason for the liner was that the alum wire would flow smoother and that the contaminants from steel wire could cause the alum. wire to corrode and get stuck in the liner used for steel wire.
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