500 psi Mask Defogger Great for Scuba Divers

I’ve used 500 PSI Defogger for over 25+ years and I don’t know what I’d do without this little bottle of magic. After throughly cleaning a new mask with 500 PSI Cleaner, I apply a pea sized drop of 500 PSI Defogger to the interior of the glass and rinse with water before each dive, my mask will stay defogged for my entire dive or even longer. As far as Scuba Monkey Dive Center goes, they are fantastic. I did have a question for them which they answered immediately. Great Seller and I will do business with them again.

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.

Been using this for years

First picture shows a 12 fl oz bottle. That is what I thought I was purchasing. Nothing in the description mentions how many ozs you are getting. Ordered and got 2 oz bottle. Why are there 4 different pictures with 4 different ozs on the product details?

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!

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.

Product worked as described. I have used many other defogger's and this product seemed to last longer and not sting the eyes if some were to get in them. I have shared this product with other people that I dive with and they all fall in love with it. Definitely a must have in any dive bag.

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.