TTriton:
Since no one has really answered your question let me give you some information.
Anti-fogs, also referred to as defogs by many are used by divers and many above water to eliminate the fogging effect of minuscule water droplets on the surface of the lenses of your diving mask.
If you looked at a piece of glass under a microscope you would find that it is a very inhospitable surface. It would have a very uneven, jagged surface. It is on this uneven surface that countless, tiny droplets of water form and cause what we call "fog".
What anti-fog does is artificially create a smoother surface where these tiny water droplets are unable to find a suitable attachment point.
It is here where the variables take place:
1. How smooth a surface?
2. What creates the smooth surface?
3. How long will the smooth surface last?
4. How much water is in the solution creating the smooth surface?
5. What other variables are present - anti-bacterial, scent, irritants, etc.
The essence of the anti-fogs are that there are a couple of non-irritating chemicals that can create the "smooth" surface and there is one of two chemicals (usually the expensive chemical "glycerin") that holds the other chemicals in place.
SEASOFT's SEAVUE simply has more of both of the above along with an anti-bacterial to protect your mask from mildew/bacteria between dives. The problem with most anti-fogs is that a lot of the companies want you to apply it and THEN RINSE IT OFF BEFORE USING IT. Does that sound logical to you? SEASOFT's SEAVUE is designed so you spray it on and then dive - NO RINSING first. It looks like you have just sprayed Windex all over your mask and that you should wipe it off first or rinse it but we promise you - once you are in the water the Windex effect is instantly gone.
Thanks for listening.
Bruce Justinen
SEASOFT SCUBA