I want to set up a darkroom but it must be one that is not permanent and only to be used occasionally. My problem is my basement has several small windows and a walk out door with a half window and I don't want to keep the windows and doors covered and don't want to spend a lot of time covering them when I want to print. What I am hoping I can do is buy a safe light type mylar filter material that I could tape over everything when I want to print. Is there such a material that would work for printing without fogging and where could I get it?