Kenny
Another point often over looked with masks:
store them in a clean container (ie plastic bag ), when not in use.
If you just hang them up over your bench or on a corner of the paint booth, the abundant air, with any and all bits of stuff and vapors floating in it, will work through the filters and cause them to be less functional in a shorter amount of time
-filter life span = more filters adding to the $$, or ££. in your case
The idea is, the mask is for you to wear, not to filter the general air in the room.
an ounce of prevention is worth a pound of cure