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This anti fog does exactly what a gel anti fog is supposed to do...keeps the fog off the lenses. I did apply some at the surface after my mask had been wet and it still worked. I believe this stuff works just like all the other gel anti fog applications and I would give them 5 stars as well. This is a convienience item that I would order every time I make an order with scuba.com
Other than the fact that I ordered a pair that were too small, these things are awesome. I sent back the larges and got XL and I cant even tell Im wearing them. I switched to the springs because my stock straps start to loosen as I swim but these stay right where I put them when I jump in the water. The turn around time on the return was 8 days and I had to pay shipping a second time but it was only 5 bucks.