I did the door seals in my darkroom with the metal and plastic things from Home Depot for sealing out drafts. The plastic bead on it presses against the door when closed and makes a perfect light seal. To install it I just shut the door, held the bar against the door frame with the seal in place on the door and pushed it a little for compression, then screwed it into place. The bottom of the door got a sweep, basically a bar with a flap that drags the floor and a metal threshold that the sweep seals against. That left a few leaks that were shut up with foam weatherstrip in the corners at the bottom. Works really well, looks good and I don't expect it to wear out any sooner than I will.