Posted by CNKS on February 15, 2009 at 19:09:53 from (216.144.104.128):
In Reply to: Paint Hardener posted by Tom in Iowa City on February 15, 2009 at 15:45:06:
I prefer to use the term hardener instead of catalyst, to distinguish between the isocyantes used in the "hardener" in the topcoat and some primers, and the non-iso containing "catalyst" used in most epoxy primers (read the MSDS to be sure). The "durabilty" of the paint is not improved that much by the hardener, that happens more because of the chemistry of the paint. But, you have to be careful with any finish. Urethanes require hardener and are more durable than hardened or unhardened alkyd enamel. Some say that hardened enamel chips easier with hardener than without, I wouldn't know as I always use hardener. As Glenster says, hardened paint does cure faster and is more resistant to gasoline, etc. That does not mean that you can spill gas on a fresh acrylic urethane paint job though, as I did once by accident. Damage is still visible, I polished enough out to make it almost unoticeable unless you know where to look. If you are only going to paint one tractor, forget the hardener. If you are going to make a hobby out of it, buy a supplied air system.
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