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 - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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