Turn the mask in for a new one.
turn in the mask
turn in the mask
turn in the mask
turn in
Turn it in
turn in the mask
Turn in mask
That's kind of a funny question. When I was an Enlisted man, I had a defective nose cup seal. It was rather unfortunate for me when I entered the gas chamber unaware, lets just say I got to see my breakfast twice that day. I used chapstick for a quick fix, however you should report the malfunction to your supply officer immediately.
You can make your mask tighter but not too much because that can cause more leaking. To check if your mask is properly fitted, you should put the mask to your face, without putting the strap over your head, and breathe in through your nose. If the mask sticks, it is a good fit, if it falls off, you may need to get a different mask. You should also check if your hair is getting in the seal, if so make sure to take the hair from the seal.
It depends on the type of mask... some consist of a (usually rubber) hood and some have just a face mask with straps to attach it. Generally it is a good idea to have short hair and be clean shaven to get the best airtight seal. As much contact with bare skin as possible should give a good seal.
perform negative pressure check
For airsofting it is best to wear either a full face paintball mask or full seal goggles with a lower half face mask. Also, cover all bare skin including gloves for your hands and a balaclava or another type of head wrap for your neck and head.