Isocyanate appears to be the catalyst behind oil based polyurethane cross
linking and curing.

"All polyurethane coating systems are produced by the
isocyanate-polyaddition process in which isocyanates and suitable
co-reactants are combined to produce polymers containing urethane groups."
Source:
http://www.pcimag.com/CDA/ArticleInf...,71242,00.html

If you do a google on Isocyanate you'll find a ton of information on this.

While I don't have any personal experience or problems from having sprayed
poly (which I haven't done a lot of - I'm just an amateur woodworker), there
appears to be a pretty good amount of stuff out on the internet indicating
many people have a lot of serious reactions on exposure to isocyanate.

I for one, don't need to find this out personally! I've gone water based
just because I'm spraying in my basement shop and fumes are always a killer
in the house, but this kind of clinches it for me.

My 2 cents

Gary in KC


"David" wrote in message
...

I can't find anything to indicate that polyurethanes contain ISOCYANATE.
Please provide ONE reference.

Dave