Heat Control Window Film, Window Tint Sun Blocking Blackout and UV Protection, one-Way Privacy Mirror Reflective Film,Explosion-Proof Premium PET Material Cosmic Black, 17.5 Inch x 6.5 Feet

The adhesion is quite sticky once the protective film is removed. The sticky side goes on the window; instructions don't say that. I recommend using copious amounts of soapy water for the application as well. Don't wipe immediately all the water as the instructions imply. Wait about five or six hours and then go back over the film and smooth things out; works better that way. I used this on the three windows that get the most heat of the day. I noticed that it wasn't as toasty in that area around 7pm. It doesn't reduce the amount of light, but does provide enough to keep curtains opens. You can see out but nosey neighbors can't see in. I have weird shaped windows; original windows from the 60s on my home, so fitting the film to the windows took some creative thought. There was an overlap of film, so I used a straight edged razor to cut things down to make the film fit. Looks good; can't even tell there is a film on the windows from the outside. This is pretty easy to use; take your time.

I am so VERY glad we bought this heat reflective film..We have a big window that faces full south so it really heats our house up in this VERY hot and dry drought we are having in Washington State..The film I bought was Mercury Blue..I got the 23.6x 6.5 ft size..It went on easily..The hardest part was getting the protective film off the window cling ..After struggling with the large window first.. I had enough left over to cover a small window in our porch that faces full EAST sun ..I figured out putting a piece of scotch tape on the corner of the protective film (not the one that goes on the window) and pulling it was sooo easy to separate the 2 films..I also used a spray bottle with just dish soap and water..I used a LOT of spray on the window and the cling..NOTE: Do not spray the window before you are ready to apply because the soap, especially on a hot sunny side window, will dry and leaves streaks and you just have to spray again.. Also, I had enough left over to do the small window in the porch.. I planned on that when I ordered..The only concern I had was I new it would be pieced together..I decided to overlap one window with the scraps..IT HELD GREAT!! You can see in the pictures I took..They are the last of windows..If you look at the pictures and see the comparison to the opened window and the window with the heat reflective film on it..you can see how clear it is …a bit tinted but still great visibility.. I HIGHLY recommend this product.. I did a test for the temp with the window covered and the window not covered..There is a HUGE difference now with the heat stopped outside! Yaaaaay! I am planning on a long term solution to the ‘heat is here to stay’ situation our climate change has put us all in. Note: I cut my window cling as close to size before putting it on..That seemed easier..I did have an exact0 knife for trimming some areas but that was minimal..GOOD luck!SECOND REVIEW ON SECOND ORDER.. I still love this product…I used it on 2 West side facing bedroom windows..I had a very pretty prismatic window cling on those but they were not heat reflecting..I cut the heat reflecting film and applied like the first order..It went on without a problem..NOTE…You can see right through this reflective window cling..My husband went outside and I stayed inside for the test..Sooo, I really missed my prismatic cling.. I wondered if it would stick to the reflective cling..IT DOES!! Sooo pretty..The first 6 pictures are the dinning room window..I have a picture of flowers to divide the window pictures..The last pictures are the bedroom window with the heat reflective cling underneath the prismatic film.. LOVE it..

Before writing this, I tested the film on three south-facing, single-pane windows installed in 1989 during a 97°F Texas afternoon with a UV index of 10. Each window had a different condition for comparison:Window A: Film applied, direct sunlightWindow B: No film, direct sunlightWindow C: No film, full shadeHeat PerformanceSurface temperatures were recorded using an infrared thermometer at the same time on all three windows.Window A: 90°FWindow B: 99°FWindow C: 97°FThe film reduced surface temperature by over 9 percent compared to untreated glass in direct sunlight. Window A even measured cooler than the shaded window, suggesting effective solar heat rejection beyond just blocking visible light.Light Control (Lux)Using a phone-based light sensor held flat against each window for 10 seconds:Window A: 2,000 to 2,378 luxWindow B: 30,184 to 33,195 luxWindow C: 2,110 to 2,223 luxInstallationThis is a static cling film, not adhesive. Water and a squeegee are all you need. Best results came when working in temperatures below 80°F or at night, since warmer conditions caused the water to evaporate too quickly. Cutting each panel slightly narrower than the window helped the film float during placement, making alignment and bubble removal much easier.Privacy & AppearanceFrom the outside, the window takes on a faint blue tint. There is no actual mirror effect. Visibility into the home depends on angle and lighting, similar to how a phone privacy screen behaves. From inside, the view is slightly dimmer but remains clear, similar to factory car tint.---Claim vs. ResultThe product advertises a mirror-like exterior during the day. In testing, there was no mirror effect, just a subtle tint. People outside can still see in unless conditions are just right, so the one-way privacy feature is limited.The film claims to block 50 percent of solar heat. Test results support this. The treated window’s surface temperature was over 9 percent lower than untreated glass and even lower than a shaded window. That is significant, especially considering the windows are 35 years old and offer little insulation on their own.Brightness was reduced by over 90 percent based on the lux readings. The level of glare dropped to what you would expect in full shade, which lines up with the product’s stated performance.UV protection was not measured directly, but the combined reduction in brightness and temperature, along with the film outperforming shade, strongly suggests it is filtering more than just visible light. It is very likely cutting UV and infrared as well, so the 99 percent UV block claim appears believable.---Bottom Line:If you want heat reduction, glare control, and added comfort, this film performs. If you are expecting true mirrored daytime privacy, it will not deliver that. The heat and light filtering are real. The mirror effect is not.