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I use Collinite SUPER DOUBLECOAT
Last Step Paste Wax
It's a company that made marine wax back in 1936, what's harder on surfaces than salt water?
They also make automotive wax too. I was tipped off about this company by a professional detailing company...he said no many people know about it except people in the detailing business.
So, I have been using it on all my cars for years and it looks great / holds up to time and elements.
Give it a try, you won't be disappointed just impressed!