You'll need a varnish and even that will only last a few years at most
in direct sunlight or snow piled against it.
Look for Spar Varnish, that's about the toughest out there.
For a color on Pine, I like Minwax Early American.
Don't know if it'll give you the look you want but I'm sold on the Penofin
products. I've used them on a mountain cabin with great results and a few
items of furniture around the yard. They do come in different colors so
you may just find something that works color wise as well.
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