I have soldered Al to Al and I have soldered Al to Cu....but its not easy. I used a aluminum brazing flux and silver solder. Its pretty wild to see Al tin up with silver solder.
I suggest using plumbers goop or Permatex as a sealant.... the Permatex sealed blocks I made were joined so tightly I had to use a torch to seperate the halfs.Cutting a groove all the way around the inside edge of the mating halfs will leave a nice bead of sealant even after clamping the pieces together.
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dirt rules
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