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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.wmbarr.com/msds/QJD40.pdf




The MSDS says that Japan dryers are 85% Stoddard Solvents. "Stoddard solvents" is just another name for mineral spirits. In addition to that, the # 3, 5, and 6 ingredients are salts, which we used in O-chem lab to absorb atmospheric water from a compound. The other two ingredients are solvents. So ... these japan dryers might dry the paint a little faster than mineral spirits, but not a whole lot. I think if you are looking simply for speed, you should use Acetone as a reducer. It will dry quite fast.

The primary benefit for the hardener is that it promotes a chemical reaction that makes the paint dry "harder," faster, and with better gloss.

Yes, the isocyanates can be scary if you don't understand them, but once you realize they don't evaporate into the air, you can see it is safe for rolling/brushing with a proper respirator and hand/body/eye protection.