Hi there; I have a really important (for me) question for all of you. I want to 3d print something in antique bronze finish and leave it outside, that means bad weather, rain, sun, wind and that sort of things. Are shapeways metals "weather-proof"?, Can I 3d print a metal statue (for example) and leave it in my garden forever?, if not, What kind of post-process should I apply to it to be safe?. What do you think?. Thank you.