I bought blackout curtains for the theater yesterday but I’m returning them today. Being in a hurry with very little free time for in depth curtain research, I opted to try some cheap Mainstays blackout curtains from Walmart. After getting them home and opening the first one, I discovered why they only cost $9 per panel. They’re supposed to be blackout but you can see silhouettes through them and the room was just as bright after putting them up as it was before with no curtains. Back in the package they went and I took a few minutes to research and order some highly rated 100% blackout curtains from Amazon. They shipped this morning for Tuesday delivery so we’ll see how well they do.