Light Blocking Strips – White 72", Set of 2 – Window Light Blocker for Blackout Roller & Cellular Shades – Side Light Blocker for Bedrooms, Nurseries & Media Rooms

We purchased this in 2022 in a dazed state of new parenthood. It worked really well to close out the remaining light and helped our toddler sleep. Two years on, I was nervous about removing it before we check out of our rental apartment. I dug out my order and emailed Sleepy Time Tracks: they were very responsive and reassuring, so I went ahead and peeled it away. Pleased to report it came off easily and cleanly in one piece, with only a slight discoloration of the paint (which I haven't even tried to remove as our landlord is painting anyway). No residue or foam left. And this wasn't new paint either, but probably a decade old (typical white gloss paint of a window fitting). I'm impressed!

Bought black out pull down curtains that worked excellent… except for the edges. Took a risk getting these but once installed they work perfect and they look like they’re meant to be there.

So easy to install and work like a charm! Pro tip: use garden shears to cut these. Regular scissors wouldn’t do it for me.

GREATLY reduces light leaks around the edges of blackout shades. Let there be darkness! One star taken off for value for money. Seems a bit pricey for the materials involved, but otherwise, five stars. Also, not trivial to fit around the blind brackets, and requires modification (i.e. cutting up) for satisfactory results - but that's not the fault of this product. Ideally, you'd leave a SLIGHT (1/8") gap on both sides of your made-to-measure blackout shades when installing to allow room for these to go in with less fuss, but if we're talking "ideally," ideally the shade companies would license these and sell them to you as an option up front.

I expected the adhesion to be a lot stronger. I ended up having to use 3M command strips which is fine but the point of the adhesion back is so that shouldn’t be needed. The product itself is great, blocks light just as expected, so I’d still recommend it!

Absolute game changer. Working night shift means needing good blackout during the daytime, that annoying strip of light to the side of the roller shades always bothered me. After installing these the room is completely dark. It’s sleek enough and doesn’t take away from the room decor. Easy to install, just peel and stick. It can be trimmed to fit the length of your window but since the material is thick it’s a bit difficult to cut. Don’t expect to use a kitchen scissors, I ended up using a utility knife and even then it was a task but I guess if it were thinner then it would be too flimsy

I returned and only received the shipping cost as a refund. Didn’t work in the room I needed. Was not worth the hassle.

These are great. I ordered custom blackout blinds and, silly me, I decided I didn't need to order the light blocking edges that were offered with the blinds. Soon realized that a lot of light still came through the edges, but the brand I ordered from did not offer the edges separately--they only let you purchase them at the same time as the blinds. I found these and they looked like they would do the job. They work really well! I easily cut off a couple inches of each strip with tin snips and had no issues with anything breaking. I noticed my window was not perfectly straight, but these flex a bit to fit against the wood. I kind of messed up and got one stuck in the wrong place while applying but was able to quickly pull it off (with no damage to the wood) and put it in place. They all seem to be holding well. I imagine you could get some new tape if you really needed to move them. I might do that, because I didn't plan and put these permanent light blockers right in front of my windows' locks and now I can't unlock the windows. Oops. I should have gotten the removable version to put on those sides of the windows. I'll swap them out at some point.

I have suffered for years between the months of April to September when the sun is up before me trying to make a sleeping mask do the trick but of course it always slipped off. I face the east and sleep literally 3 feet from the window. For years, I just suffered. Then last summer I actually went to the big box stores looking in different aisles like trim work, flooring and paint/wallpaper departments for L-shaped trim or something could could block out the light with no luck. Then I found these on-line! I messaged the seller as I too have painted window frames (very old wood), and knowing what I know, I thought instead of taping on, I'd pre-drill holes into the plastic and window frame then screw down. And it worked great! I've attached pictures to show you with the lights on in the house and the lights off (both during the day). The warmer image is the lights on. I wanted the flexibility to remove the strips to clean my window, Otherwise I would have just stuck them down with the tape. I saw a few reviews that mentioned it removed the paint from their window frame, but honestly, wouldn't any adhesive? That's just the way sticky tape and paint goes, especially with an area exposed to heat, cold and moisture. Don't fault the product for that. I'm sure the adhesive would have been great or the option with the magnets too (which would have also pulled the sides in much tighter to the frame to super black out) but I was willing to take my chances with my adaptation. I also trimmed the upper corners with a pair of durable scissors to fit around the top rail and block the light out up there as well. Please keep in mind this material can fracture if you take it upon yourself to cut in a manner like this, which I was prepared for. Again, don't fault the product. There were no issues cutting the length down. Sorry, I should have take a before picture but I was excited to get them up right away. I had about 3/8"-1/2" of light coming in on each side.But you can see by the light at the top and bottom how bright just a sliver of light can be. These things rock! Wooohooo!

I have two complaints. First, I wish they (or the foam tape) was thinner, installing them required me to remove the end caps from the bottom bar, and even then the fabric only has like half a millimeter of clearance on either side, and only then after a lot of tweaking. Be warned that they may not fit in your window if your blinds were professionally measured/installed (and thus have narrow gaps). Second, I wish the part that adhered to the window frame was wider. Honeycomb shades are not a uniform thickness when they're down, and due to that and slightly out-of-square window frames, there's maybe a quarter or half inch of the white window frame visible for some parts of the blinds, letting light through. I've added some black gaffers tape to try to extend the black area on the window frame, but it's not as thick, so it's not ideal. If the light blocking strips were like half an inch wider, they'd block a lot more light for me.