the pj has arrived. had it out and it looks sweet as a nut. needed it out for measurements of where the mounting holes where. then it went back in the box and i building the framework for my screen last night. material is here and waiting on flok tape from nexnix. hopefully all done by the weekend for some hard sessions of movies and xbox
I wouldn't recommend ironing BO material usually it has been treated with an acrylic coating that wont enjoy high temperature if you do then use a cool iron over a damp tea towel as you mention.
As PJ mentions, any light creases will pull out nicely once you have it fixed over the frame, just make sure you work from one side then over to the opposite then back again etc pulling the material taught.
For heavier creases I'd probably bin it or take it back to the shop (alternatively use it for whats its made for in the first place, blacking out windows ) and get some more, ask them to roll the facric and not fold it!
ta for all help guys i gave it a quick once over with the iron over a tea towel ! when i say i im lying, me a male iron jeez my nan ironed over and did a stearling job. we then stretched it over the frame tought and it has no creases and is flat as my ex girl friends chest. when i say "we" i stood and watched and helped hold the fabric while my uncle did it. now waiting on flok tape from nexnix and im sorted for some quality movies.