Respiratory protection while spraying

[bigeasy1]

Several years ago,i sprayed one of my boats with sunfire,a two part urethane that is like Imron,and contains isocyanates which i found out later,require an air supplied respirator.
At the time,the guy in the automotive paint store where i bought it,told me that a regular organic respirator would be fine.

I worry about this now,and from time to time,wonder if it did any damage.
I'm going to spray my Tsunami with a two part urethane this summer,and will definately use the correct air supplied respirator.
I think it's to risky to cut corners when it comes to something that could possibly kill you.