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 - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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