I have a hub, with a black roof, that I spear out of.it is getting to where it lets a bit more light in then I would like, mostly, I think I am going to be siloueted then to bright. what do you guys use to darken up the material? I am assuming the material is just getting stressed from being set up, and taken down a hundred times. I have even considered a second layer on the inside, but might be tricky to get up there, and not sure how I would secure it. It is not insulated