ATJ
Contributor
The position of the mask strap on the back if your head can also make a big difference. I often start a dive with a leaking mask and adjust the position of the strap on the back of my head until I find the sweet spot and I get no leaks after that.
I also found out during my dive course (in 1978) that laughing (had a humorous instructor) makes my mask leak so I have taken a more serious attitude to diving.
I also found out during my dive course (in 1978) that laughing (had a humorous instructor) makes my mask leak so I have taken a more serious attitude to diving.