Silicone works well for glass but keep it away from copper! the acidic acid in the silicone will eat way at copper, it might do the same with aluminum, not sure, you can buy more expensive silicone II caulk that does not have acidic acid in it but it's close to the same price as polyurethane caulk, a much better, stronger caulk, I like to use the black roofing polyurethane caulk for stuff that is in the sun or gets hot, it will hold and never let go, 50 year life span.
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