When someone suggests "West System" they're usually advising to put a coat of their epoxy on it. While this is a great water proof barrier, it doesn't stand up to UV too well and tends to yellow and eventually crack.

Krylon/Rustolium would probably hold up OK for a quick and easy finish and be really easy to touch up later (you will probably need to).

Awlgrip is probably the best ... a good paint like Dupont Imron would do well too. I believe both of these paints are two part paints that you mix with a catalyst - they do not air dry, rather they cure like epoxy or polyester resin.