Ok man, make sure you wear a respirator when your are putting gas in your car, or if you are changing a fuel filter or anything, or even working around your car, because gasoline contains benzene, a known carcinogen. And keep wearing all that safety stuff when you're outside, because there is brake dust and tire dust blowing around, not to mention pollen which could trigger an allergic reaction...speaking of allergic reactions, be careful waxing your car outside, because if you get stung by an insect, it could cause anaphylactic shock which could be fatal.
Why are you obsessing about a microscopic amount of sealant dust, when every day you are in contact with more dangerous compounds? Do you ever use any household cleaners? Do you put bleach in your wash? Do you use toilet bowl cleaner? Drain cleaner? Do you change your own oil? Top it off? Put windshield washer fluid with deadly methanol in it in your car? Anti-freeze? Second-hand smoke? Do you smoke? I work with a guy who thinks that everything we have at work is going to kill him, but he keeps smoking his cancer sticks.
If you are this traumatized by the process, I seriously think you need to seek out a detailer to LSP your car, so you don't expose yourself unecessarily.
Edit: Also make sure to check the contaminant analysis done by your water company (presuming you don't have your own well) because there are all kinds of chemicals, poisons, etc., in the water you drink/bathe/cook with...BUT THEY ARE ALL BELOW SOME ARBITRARILY SET LEVEL. Who knows who set those levels and whether they are REALLY safe? You should get one of those charchoal filter gizmos...just make sure that the glues and so forth holding that filter together aren't leaching any chemicals into your "clean" water, man.