Things are moving along with my darkroom construction (a garage being converted to a room). It's time to start thinking about light proofing it. It's a multipurpose room with a door in the front and the rear. I've had the builder build a sheet rock (or gib for the international crowd) box around each door which creates a small hallway. I figure, have a darkcloth in the middle of this microhallway, and have another at the end which faces the inside of the room. This should help with my paranoia of light leaks. I'm looking for a fabric to use for the curtains. I've seen the stuff some people attach to their house curtains to reduce light but am not sure if that's good enough? Are there any companies that make heavy dark cloth material at a reasonable price cut to spec? Or should I make my own? The lab I used at college had one of those rotary doors, would love to have 2 of them but am not rich! Thanks for any info. I searched the forums but didn't find much.