Unless the tree huggers have forced the paint manufacturers to changer their formula, acrylic enamel hardener contains some cyanide compounds that are extremely toxic and can be absorbed through the skin. The safe way to use the stuff a few years ago was to wear a full coverage "shoot suit" that leaves no skin exposed, and use a respirator that supplies filtered air from outside the paint booth. Of course, it's been 25 years since I did any professional-level paint and body work, so things might have changed since then!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!