Hi! I really need some help and advice. For my final project in art for my last year of school I have decided to create a life-size angel and put it in the garden as an installation at my school. I need to know how I would go about getting started and can I use paper mache? Will it deteriorate or get ruined when it rains? Is there a special water/wind proof glaze that is not too expensive that I can get in Australia to put over the top of the finished product? Thank you for your help!