Rivets: Aluminum or Stainless?

[Brion Toss]

Hi Bill,
Yeah, we ordinarily prefer to use stainless rivets for anything heavier than a winch handle pocket. But your conduit is in that range, so aluminum is fine. Goop the rivets anyway, as they are of a different alloy than the mast, so can still make your paint bubble. And do you know the two-holes-and-a-hook technique for attaching the conduit?
Fair leads,
Brion Toss