I have a county fair display coming up this September. Its a large barn type building with about 5 or 6 huge doors that are open first thing in the morning. In the morning its pretty damp, then in the afternoon and evening its pretty hot. I am hoping to get the spot I had a few years ago that didnt get much direct sunlight. At the time I displayed a ton of 11x14's but this time I want to display fewer but larger pieces. They will be there for 8 days. I am trying to decide between metal or canvas. I like the idea of the canvas because overall its cheaper and I can get more creative with the "cluster" look/layout. But im not sure if those conditions will be disastrous for them. One thought is to spray the canvas with the clear spray that you usually put over drawings or paintings to protect them. Any tips? Which ever method I choose I will be hanging chains or something like that from the horizontal bar at the top to space them out, and anchor them at the base so the wind effect will hopefully be minimal.