Daryl, I was wondering about the air flow thing.
When I spec'd my Blow Therm even back in '93 along with the million BTU heater on the air makeup, I had water borne in mind, though it's still not mandated up this way...............yet.

But now that I don't have the business anymore, the little painting I do is all without much airflow. Does the waterborne stuff you use work outside of a booth environ, or maybe high flow prep station?