Thanks for the heads up.. I was planning to use a paint mask anyway, but this is good advice. I did a little more research on this, and apparently it is ethyl alcohol with the denaturing agent (toxin or bittering agent) added. In the case of a methanol denaturing agent, it can cause blindness and death. http://chemistry.about.com/od/chemic...ed-Alcohol.htm
I wonder if Zinsser provides this information?