How do you check your mask? or its fit? is there any way? I don't have facial hair but sometime I do that. Or is the full suit the only real answer?

Jay:
I think the standard check is to block the air inputs and suck in, and see if the mask seals to your face.

I use a fresh air supply (HobbyAire) with a hood for painting, and the separate fresh air supply mask if I'm sanding/grinding inside a boat. Pulling the air hose around is tedious but I've gotten used to it.