First, the material is packed folded. To remove those wrinkles proves nearly impossible. In attempting to büglen the fabric on a low heat, this sticks to the iron. For higher heat supply this would probably be charred immediately.
Unfortunately, the green screen is translucent, which is a working outdoors only twice folded and allowed with dark backgrounds. Generally, this is very, held "substance" very thin.
For absolute indoor hobby applications like this screen still grade as sufficient (in the case that can be somehow eliminated the wrinkles).