It contains "hexamethylene di-isocyanates." I looked up the info on that chemical and found this: http://www.atsdr.cdc.gov/tfacts120.html

I also found the MSDS for the Van Sickle enamel hardener: http://www.vansicklepaint.com/7019X.PDF

The number one ingredient by weight is the Isocyanate. I also called the local OSHA office, and they said that the primary danger of isocyanates is in spraying -- breathing the fine droplets. They recommended good ventilation and wearing a respirator.

So ... I'm thinking maybe you are right about this. Perhaps the primary danger for isocyanates is for spraying. Rolling should be fine IF YOU USE A PROPER ORGANIC VAPOR RESPIRATOR.

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After the results I've had with the hardener, I'm convinced it's the way to make this process work. When I do have more time (whenever that is) I'm going to do some more work with it. Safety shouldn't be an issue, as long as (like you said) you wear the proper respirator.

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The hardeners look kinda scary, especially with "cyanide" part of isocyanates. Boat sites mention the use of Japan Dryers to speed up the drying time. Although not completely safe, wouldn't the use of a Japan Dryer be less scary?

http://www.clcboats.com/forum/bbs.pl/cart_id=/?read=76556

http://www.go2marine.com/product.do?no=32695F

http://www.wmbarr.com/msds/QJD40.pdf

http://www.packserv.com/Data/Products/Data-Sheets/1585826406.pdf