What I did to temp. black out my window is build a frame of 1"x1" wood and stapled on material from one of those pull shades. Painted one side black. Stapled oversized fabric and then foam on the edges. The over size fabric hangin over the sides blocks any stray light from the sides and helps hold it in the window. I just push the thing into the window frame...and instant dark. If this doesn't make sense, I could take a picture. Let me know.
Originally Posted by Egnojed