Isocyanates have no odor, so not smelling anything doesn't matter much. 4-6 hours is WAY to long for a charcoal mask to protect you against Iso's. The problem with charcoal masks is that you can't tell when the cartridges need to be changed. You can use your charcoal mask for all one part paints, or epoxy primer, the catalyst of most do not contain iso's. Urethane paints and primers require hardener. For acrylic and alkyd enamels hardener is and option, but just as dangerous. Charcoal masks can be labeled for Iso's only if you have a way to monitor the concentration in the air and/or have a cartridge changing schedule. You must also have an approved paint booth, something that very few hobbiests have. Painting without supplied air while using hardener is simply not a good idea. As stated, the effects are cumulative, and you do not know when the Iso's are going to cause problems. But, at least for hobbiests it is their decision.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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