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Hi Rusty, I think some people are much more sensitive to iso exposure, even minimal amounts, than others - and it is not something you can know beforehand. Also, as you say, some hardeners (that for IMRON is notable) seem to be a little more toxic than others. I understand some (even pros in the business) regularly paint using hardeners w/o fresh air. Not me though (anymore). I was affected the first car I did with hardener - Centari AE w/793S, using just a charcoal mask. And I wasn't in the business. Only took about 4 hours after painting. I was just too stupid or ignorant or bull headed to "get it" the first time though. After a second car and similar coughing w/severe shortness of breath all night, I finally "got it". The third car was done with fresh air and I have never had another problem in 30 years of painting off and on, here and there, always with hardener. I do not recall back then using a prefilter to the charcoal mask but such details were not well stated at the time - perhaps not even known. Indeed, the hazards of isos were not advertised well either. Not so today. There are plentiful cautions about iso exposure and recommendations to deal safely with it. No excuse if someone wants to do just a little bit of reading on the subject. He who ignores the written safety recommendations from the product manufacturers does so at his own risk. I agree that air-dry AE w/o hardener avoids the iso issue but keep the gasoline off it for months.  Rod
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