2 to 5 business days
This anti-fog treatment uses cutting-edge moisture absorption technology to prevent any sight-restricting fog from appearing on your lenses. The application process is pretty straightforward: clean your lenses, shake the bottle to activate the anti-mist formula within the treatment and spray a light coating onto your glasses. It is important to remember to dry the area gently with a cloth.
This process creates a transparent, micro-thin coating that is said to last up to five days. There is a bit of a smell at first but it is inoffensive. We found the treatment to work perfectly initially, however the effect ultimately lasted for two to three days, rather than the full five. That being said, the bottle is easily kept to hand and can be used to re-spray the lenses whenever needed. We found that the longer the time period between spraying your lenses to actually putting them and your face mask on, the better the result of the treatment â so make sure you plan ahead before leaving the house.