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

Read what I said above again and I will add more here. I have seen people paint Imron and the first time and was their last. I don't even know if Imron is still on the market.
Decades ago I was painting horse/stock trailers with alkaid emamel. Then first time I used single stage enamel with hardner, abour 24 hours later I began to run a fever, actually i felt like I had high fever buy thermometer said not. I am allergic or highly sensitive. The bad chemical is that isocyanide. Other chemicals in paint can also be an issue.
I would definitely paint with garage door open and have several good fans blowing out flumes. NO this is not like a real spray booth. Realize you will have overspray on everything.
NOTE" Disclaimer: Paint at your own risk.
This is not a new discussion.
I have seen guys paint for the first time and have what their is called chemical pneumonia.
I use a full face respirator. Not as good as it should be but gets me by. I could never afford to pay a shop or deal with their BS.