Barrels & barrels of aluminum chips, But no aluminum dust.
Gary Gary had experimented with the interface of the copper riser tubes and the aluminum absorber fins of a flat plate solar collector. He concluded the household type silicon caulking had performed admirably.
I'd bet the silicon sealant would bond the two mating surfaces for the expected life of 20+ years were I have seen epoxy dry and the bond fail after a number of years.
Randen
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