This thread was a great one, and still is.
He used silicone caulk, but I'd like to recommend ProflexRV instead:
1) It remains more flexible than silicone.
2) You don't have to remove every molecule of ProflexRV if you need to reseal, unlike silicone.
3) Removing ProflexRV is much easier than silicone, if you do need to remove all.
I don't know if Pat mentioned it, but every time you insert a stainless steel screw into aluminum, squish a dab of ProflexRV into the screw hole so that the stainless steel won't be indirect contact with the aluminum. Otherwise, you risk the aluminum eroding.
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