Tony:
You bring up a vital point regarding the VOC's that you smell, whether its from Zero Rust or any other paint product. When using any of them, you are well advised to use adequate protective devices.
This is particularly true of the moisture cured urethanes, which contain Isocyanate derivatives.
Please read the article by Rebecca Vaughn found at the bottom of our contribution to your Stovebolt Techtips and found here:
http://www.stovebolt.com/truck/techtips/rust/zerorust.htm as it helps makes light of the dangers that many DIYer's need to become much more aware of.
HTH
WK Irish
