KeySmartFogBlock - Anti-Fog Spray for PPE Masks with Glasses, Sunglasses and Goggles

I live where it is cold outside and I like the temp in my house to be toasty so when I go outside my glasses always fog up. This stuff keeps them clear. No more taking off my glasses and squinting to see until they clear up.

This was hyped as an amazing anti fog. I'm a full time photographer for decades with glasses who has worked indoors/outdoors and under all sorts of conditions. Willing to try anything which improves my working conditions. Even something new and much more expensive than my tried-and-true options. All anti fogs work by leaving a film on your glasses so that its harder for condensation to form. This worked OK. Was easy to apply since it's a spray as opposed to others which you rub on. Those leave swirls, this is easier in that sense. But I had to sit and wait for this one to dry as opposed to the rub on ones which are "done" immediately. Didn't help at all with "mask fog" which it was heavily touted for. There are alternatives which are cheaper and work just the same. More convenient than rub-on. Works the same as cheaper alternatives. Not sure that's worth the premium price.

So far this stuff seems to be working. You clean your glasses, then spray both sides of the lenses and let it dry for a few minutes.It dried clear, without any waviness being visible. I tried a different product that had to be wiped on, and it distorted the view through the lens. THIS stuff is perfectly clear. I tried my best to fog the lenses by breathing on them and they would not fog up!If this stuff was a bit cheaper Id give it 5 stars instead of 4, but I may well buy more of it.

I had high hopes for this spray after seeing it on GMA. I have found, however, that it takes much longer to dry on my glasses than expected and leaves behind speckles. If I'm going somewhere where I have to wear a mask, the timing of application is tricky. If I put it on before I leave my house, I have to be sure to allow 10-15 minutes for it to fully dry and my glasses are cloudy when I drive. If I wait till I arrive at my destination, I have to sit in the car for 10-15 minutes before being able to wear my glasses. It definitely helps with the fogging part, but is not as convenient as I had hoped,

As a glasses wearer, I've tried my of the hacks that are supposed to keep your lenses from fogging when wearing a mask. The only solution for me, thus far, has been taping the mask around my nose and cheeks. I tried this product along with another that is applied with a cloth. This only keeps the centers of the lenses from fogging up. Imagine looking through a tunnel with fog around the edges. This spray also seems to make any scratches on the lenses more noticeable. I had to go back to taping the masks to my face. If it wasn't for wearing glasses, wearing masks would be more comfortable and less of an issue.

I’m amazed! This stuff really works at keeping my glasses fog free while wearing a mask. I tried EVERYTHING! The only thing that I had any success with was tape but who wants to carry around a roll of tape? Plus tape hurts when you remove it. And what a pain of you’re in a situation where the mask comes off and on. I just sprayed this on the lens, let it dry and it worked great! We went out to dinner and the Lee lenses were still fog free when I put my mask back on after dinner. It arrived on time and was packed very well. And it works on glasses that have a special coating. I highly recommend this product!

The defogger works. Be sure to follow the instructions - I think those without good results may not have done that, or had older style lenses with coatings. Sometimes when I’m walking in the cold, a brisk up hill in the wind, my glasses fog for a minute, but then clear up. Basically, it’s a huge relief to be able to see while walking in the cold weather with a mask on.

I've ordered this three times for one of my kids that wears glasses. I've also ordered three other kinds, and returned them. All of those were "spray, then wipe" which seemed to defeat the purpose and in effect, didn't work. But this works well, as long as you clean your glasses first, and spray liberally (one or two sprays works for us) on both sides of each lens, then sit and let dry for 5ish minutes. Don't wipe away the fog spray, just let it dry. My kid is able to use this throughout the school day and re-spray each morning before he leaves.

I bought it for my glasses for outdoor use. I applied it to my glasses and going out for dog walking, and the fog is still there and make my glass very blurry.... I guess because it's too cold outside? i am not sure, but not recommend to people who wants to use it outside under 0 degrees C.

Doesn’t really work at preventing fog up. When it did it didn’t last long.

Works great on my PPE masks. Never fogs up, only have to apply it once and it lasts for my 8-hour shift. A bottle lasted me for 4 months.

Price good but still some fog, moisture

great product - it came early and works great. will be buying more in the future