500-PSI : Picture 1 regular

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500-PSI : Picture 1 regular

About 500-PSI Mask Defog

500 PSI Mask Defog is without question the clearest, longest acting and most effective defog on the market. One application works for at least three dives in one day. Cleans your mask each time you use it. Wet or dry application, has the consistency of extra thick toothpaste, and when applied to the lens typically lasts all day long. 500-PSI Mask Defog comes in 2 or 4 fl. oz. (59 or 118 ml) size with a 2 fl. oz. (59 ml) available with a carabineer clip.

The 500-PSI Mask Defog is commonly used for All Diving Applications, Cold Water, Professional, Recreation, Warm Water and more. The 500-PSI Mask Defog is most used by customers who consider themselves to be a Advanced, Recreational Diver among others. The 500-PSI Mask Defog is popular because customers like the following qualities of the 500-PSI Mask Defog: Easy To Use, Functional, Improves Diving Experience, Lightweight.

500-PSI Mask Defog Features

  • 500-PSI Mask Defog
  • De-Fogs Sports Lenses
  • Great for Snorkel or Dive Masks
  • Clearest Longest Acting Defogger
  • One Application/Three Dives
  • Cleans Lens Each Time
  • Wet or Dry Application
  • Applicator: Spray Bottle
  • Content: 2 or 4 fl. oz. (59 or 118 ml)
  • 2 fl. oz. (59 ml) Available with Carabiner Clip

500-PSI Mask Defog Customer Reviews Powered by TurnTo®

Review Summary


(based on 27 reviews)


of respondents would recommend this to a friend.

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Most Liked Positive Review


Seeing is believing

The 500 PSI antifog works well and is good for multi dives before an additional application is needed. Much better than the "more liquid anti fogs out there.


Most Liked Negative Review


It's OK but it leaves grit in my mask

I know that some people love this stuff. I got it as part of a mask/snorkel/fin package. It works fine but it leaves a gritty residue around the borders of my mask that I have to scrub out at the end of the day. I switched to "Spit" or Mcnett's "SeaGold". They work as well or better and i don't leave the gritty mess. I gave the 500-PSI to a fellow in our Dive Club who swears by it and says he doesn't mind the grit so I guess it's just a personal choice.

Reviewed by 27 customers

Displaying reviews 1-5

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Not so great


from Southwick, MA, US

Very watery consistency. Mask fogged up immediately.


Works wonderful


from princeton, NC, US

This blend of Def-fog has been around for a while. It works great and if there is left over residual it wont burn your eyes as bad as other brands. keeps the mask free of fog for a couple dives.


Very good


from Newark, NJ, US

This is my favorite. I have used others and they are ok but I keep coming back to this brand. For me it works best.


Best Defog Ever


from High Point , NC, US

This is the best mask defog that I have ever used.


Works great


Thick consistency, rub on, rinse off, CLEAR.

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Questions & Answers Powered by TurnTo®

Questions about this item:

Shopper  Why Did You Choose This?
Ralph G  It cleans and defogs . Also it lasts for 2 tanks
WYATT H  I've found it to be the best I've ever used.
GARY S  recommended by dive instructor
JENNIFER P  The BEST mask defog I have EVER used. I have NEVER had my mask fog up on me.
PAUL B  Duped. Never again.
PAUL B  Stinks. Came free with a bag. Never by this product. Seafoam or Seadrops are the only way to go if you buy the stuff. Baby shampoo does a better job and won't burn your eyes.
MATTHEW O  The only defog worth using. It costs a lot because it works. Yup it's expensive so buy the big bottle if you're going to do more than 50 dives
TRAVIS K  Waste of money, I keep the same little bottle with a few drops of "Dawn" dish soap and water. Then it doubles for making drysuit seals easier to pull on.
Daniel R  Is this now a spray? What happened to the old style squeeze bottle kind? Is it as effective and does the bottle last as long?
Frank L  This is a squeeze bottle.
ROBERT P  The defog I bought was not a spray, it was the same old squeeze bottle.
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