With respect to respirators, make sure you get the right cartridge for your
intended use. You can get:
Dust (particulate) ones - they don't keep out fumes of any kind,
Activated carbon - Absorbes organic fumes, won't keep dusts out
Acid fumes/Basic fumes - does that not dusts
Also combination ones
When not in use it should be stored away so as not to become contaminated.
Also make sure it fits you face well (beards are generally a no-no).
Tom Bregante