500 psi Mask Defogger Great for Scuba Divers

Easy even for the little lady to apply and works all day long.We snorkle the Pacific in SoCal and this stuff never lets us down.Smear it around the lens, rinse of the excess in the water, and be preparedto see without any distractions. I can literally rinse my mask untill duskand still not need any more...clear that up for you?

Been using this for years

Initially had problems getting this to work but was not following directions (helps to read directions). I coated my lens upon arriving at the dive location and it sat while I prepped my gear. Last think I did before hitting the water was to rinse the mask but was using my glove, directions say to use finger ONLY. After using my finger it worked much better from that point forward. I also cleaned and prepped my mask with toothpaste several times before using this product. Through trial and error and some online reading found the best way to prep a mask was to use regular old white paste toothpaste, add some to the lens with your finger, spread it out then let it sit for an hour or so. Get a soft toothbrush, get it wet, shake the extra water out then scrub the toothpaste into the glass, don't bear down, similar pressure if you were brushing your teeth. Paste will foam up, make sure you scrub along the edges. Spend some time doing it until you feel like the glass is "squeaking" (not sure how else to describe it). Rinse all the paste out then without drying breath into the mask, see where it fogs up, repeat until you don't see fog when you breath into the mask. That seemed to work for my new mask, now with the 500 psi it really doesn't fog up at all. That was more than anyone needed to know but maybe it will help in your quest for a fog free mask.

i dont know why but this works better than spit or baby shampoo on my snorkel mask. I also use it in the pool whem i swim laps and it keeps my goggles fog free.

A dive buddy "lent" me some of his 500-PSI Mask Defog last year, after noticing my struggle with the dive boat anti-fog (dish soap). It worked SO much better than soap, and no issues with eye burning. My local dive shop sells and swears by the 500-PSI, so I bought my own bottle. This is a very thick paste. I found that it can be difficult to rinse your glass clear when you're ready to dive in. I also bought another product, Stream2Sea Reef Friendly Mask Defog, which is a thinner gel, but works as well as, often better than 500-PSI. I just returned from the Caribbean, where I did 15 dives, between 12m/40ft - 28m/90ft. I used both the 500-PSI and the Stream2Sea on alternating dives. The Stream2Sea goes on easier, clears easier, no eye burn at all, and works better than 500-PSI, plus is (stated) reef friendly. I'll stick with the Stream2Sea going forward for all my diving. But the 500-PSI does work well and will not cause you eye burning from fumes or potential for soap in your eyes.

This is the first time I think I've given a 1 star review. But it's pretty straight forward. The product did not work AT ALL. I live in southern California. The water temp in the beaches around here is 60F-70F during the summer. So it's not warm like in Hawaii or tropics. My masks have always gotten fogged up so I decided to give this a try. The product is a thick blue gel. Almost like a toothpaste. Directions are simple - rub on generously and rinse off with water. I did exactly that. Within 1-2 minutes: FOG. So I tried rubbing it on and letting it set for 10 minutes, then washing it off. Still got fog. 20 minutes -FOG. Thin or thick layer - FOG. I tried on different lenses - goggles, dive mask, a high end full face snorkel mask. All got fog. Tried glass and polycarbonate: FOG. Before I wrote this review, I had tried it on all types of stuff using different techniques (even different beaches!) and in the end I still got fog within 1-2 minutes. So for anyone that says this stuff works, I don't know what to tell you. Guess I got the ONE bad bottle out of the thousands produced. Sorry, this stuff just doesn't work.

I bought some of this at the local dive shop in Kailua-Kona, HI when I came for vacation years ago. Never thought too much of it... it worked. Well a couple years later we moved here and used it more often for diving and snorkeling. It wasn't until I ran out and used some other stuff (many different kinds) that I realized exactly how much I love this stuff. The dive shop no longer carried but luckily Amazon does! I really recommend it. The only downfall is when it dries it will leave a white residue... it will clean off, but it hides in the corners of my lens.

This review is for the 500 psi Mask DefoggerWe used this almost daily while snorkeling in the Caribbean and it does the job! One 2 oz bottle will last two people a long time if you use just a little each time. We never had any fogging while using the 500 psi. It's a must have if you are diving or snorkeling!