Multiple step approach here. First I trim the mustache down close (groomsman works great) than I trip about 1/8th inch under my nose, and lastly I use a little of this ( Buy Trident Mask Seal Stick LP95 with reviews at scuba.com )
Than again it is difficult for me to find a mask that seals well anyway, my face is considered narrow.
Than again it is difficult for me to find a mask that seals well anyway, my face is considered narrow.