This video shows the process I used to create my Chroma Key Background. I already had the frame (4m x 2.7m) built from a previous background i painted. I added the black plastic layer first. This was used to block any backlight that would silhouet the frame, to keep the paint from dripping, and to prevent the cloth from sticking to the frame. Next, the plastic was stapled, starting from the center on all sides, and working my way out. It's important to stretch it as much as possible, to get a nice tight finish. Afterwards the sheet cloth was stapled over the plastic, also working from the center outwards, and really stretching the cloth. Once the stapling was finish, I applied paint I got from a hardware store. It's a regular citrus green, that looked bright (or light...) on the catalog. Two liters (in two layers) were applied.