Right when you think you've got a successful respirator, at the end of the day, blow your nose and see if you got rid of enough composite to make a small piece of sheet goods.
I also found that removing the mask too soon because of discomfort was a habit. I hardly ever use particle board or MDF, but the same holds for real wood dust. That stuff can linger in the air for quite some time. One unconsciously touches their face, or eyes, or mouth, and the exposure becomes internal. Since my exposure is daily, I am an extreme example. Besides just that exposure, add the chemical exposure, and I'm surprised I'm still alive. I do have an irreversible dry hand skin problem, nerve damage and tendonitis in the hands and fingers, and am a bladder cancer survivor. I also have the onset of breathing problems. Oh, almost forgot... slight hearing loss (those darn routers).
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