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I only saw one poster mention this... temperature differential.
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Has anyone tried the Rain-x anti-fog wipes?
Predive/dive:
work up a good gob of spit...and hork one into the mask...wipe with fingers or if available some sea weed. rince. and leave water in the mask if you are not going to put it on right away. Next soak your face to cool it off. a warm face will fog your mask . Once you are ready to hit the water empty the mask out rinse and put it on.
For a sure fix, take a lighter and carefully burn the glass so a soot forms. Then, rub toothpaste to remove the soot.
Dave (aka "Squirt")
I'm not 100% sure but I think I read somewhere that the rain-x wipes are not for close exposure to the eyes.. Check the label carefully on these before using on a scuba mask.