A good mask will cost you somewhere around $60, but most masks are pretty much the same base... its the cartridges that are the important part. Get carts that are registered for fume use. But as a chemist, you'll probably be familiar with them.
Sorry to rant on about the urethane. But silicone and urethane go hand in hand and most folks don't understand the dangers. And unlike you, most folks don't understand the importance of reading the MSDS and following the precautions.
And quite frankly, from personal experience, the MSDS for urethanes isn't nearly as explicit as it should be. It should have large red letters that say "FOLLOW PRECAUTIONS OR DIE" on it. If I ran the zoo, that's how it'd be!
-Gordon
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Liberal, Atheist, and just as Patriotic as you. 
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