Posted for daniel newland <compositeguy@sbcglobal.net>:

 Hi Dan et al.
 
 That isn't an urban legend about the linear polyurethane toxicity. You are
cross linking it with crazy glue essentially, an isocyanurate,  Stuff best
left in the can, not in your lungs.  But a filter mask will work well (if you
haven't used the same filter cannisters for the last 15 years).  Do be sure to
use the correct filters for organic solvents.
 
 Also, a good HVLP paint sprayer DRASTICALLY reduces the amount of overspray.
 
 Dan Newland