For my kitchen set-up I use simple black plastic sheeting over windows and doors, available in huge sheets from a gardening store. I hang the sheets from small nails and use duct tape reinforcement on the plastic around the holes to stop tearing. It only takes me a few minutes to put up the sheeting and though I only print at night with some diligence I could probably completely lightproof the room. However I think that the weatherstripping mentioned in another reply is the first step.(posted 9783 days ago)