painting Respirators (single stage Urethane-BCCC ) what are you using ?

I bought a full face 3M respirator for painting my '66 Dart in my garage. I used it when I painted the jams and trunk a few months ago and it worked out great. I'm pretty sure my half mask would've been fine too.

It's hard to warrant a fresh air system just doing a paint project every once in a while.