What should I do with my new mask? There is a protective coating on the inside of the mask when you first get it. Take a pea size peice of toothpaste and rub it on the inside of the mask lens for about a minute and then rinse off. This will stop the mask from fogging up when used. Then before you use the mask each time add a few drops of Sea Drops Anti Fog solution and this will ensure the lense does not fog during your dive and spoil your enjoyment.