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

I want to do some painting (door jams, engine bay ets) just for my stuff...not for daily work. What Respirators are you guys using to spray single stage Urethane and or Base Coat Clear Coat ? What do you feel safe with for occassion use ? I will be painting in 2 car garage, with fans pulling out fumes ( i guess I can leave the doors open if needed also ),, Are full face respirators needed ? fresh air respirators needed ?????? Just looking for advise. Thanks When it comes time to paint the body I will send it to a shop .