Thank you for the question.
Unfortunately at this time we do not offer a coat rack with an exterior finish.
I can think of two options. the first is we could make you an unfinished coat rack That you could finish with an exterior finish but that does not sound like it will help you out much as you are in a time crunch. I am not expert on exterior finishes, but I would think that a good exterior
paint would be fine, or a marine grade varnish such as Valspar.
The second idea is to use one of the PVC wood substitutes if I recall one is called Aztec. It comes white and has a wood texture it is commonly used for exterior trim pieces as it will never rot.