If you are happy using an epoxy on its own so be it, I wouldn't personally. "Resistant" is a the key word and if the Glue, Epoxy etc, is the only bond holding in all together I would not trust it over a long period of immersion as this could slowly break down the bond until one day it just falls off. Probably wont happen but it's another possible reliability "risk" I'd rather rule out.
Mixing metals was referring to different blocks in the system. If a water only system is required then all the blocks rad and everthing in the system needs to be of one metal type to avoid galvanic corrosion, and copper is preferable over alu for performance.
I wasn't suggesting Artic silver was a better epoxy but it will at least transfer heat rather than act as a insulator of it. I used it as a seal on the first block that is held together with screws.
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