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Antique Tractor Paint and Bodywork

painting with hardner/using air supply

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Terry

07-22-2003 18:11:13




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Are there some hardners that you wouldn't need air supply with a respirator?? I am using IH 2150.

I have been thinking about using my sandblasting hood while painting and bring in an extra hose from the compressor and place it under the hood.

Ok, try not to laugh.

Would this approach work with a respirator??




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Red Dave

07-24-2003 06:59:56




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 Re: painting with hardner/using air supply in reply to Terry, 07-22-2003 18:11:13  
Unless the compressor is designed to supply breathing air, OSHA says it must be filtered and have a carbon monoxide detector/alarm before you can breath it.



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CNKS

07-22-2003 18:30:18




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 Re: painting with hardner/using air supply in reply to Terry, 07-22-2003 18:11:13  
The answer to your first question is no. As to your second question, I have heard that compressed air has impurities in it that are not suitable for breathing. There are filtered breathing setups for compressed air, but I think they cost as much as a separate supplied air system.



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big fred

08-11-2003 14:45:21




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 Re: Re: painting with hardner/using air supply in reply to CNKS, 07-22-2003 18:30:18  
I would say the answer to the first question is a qualified "no". After Desert Storm, the Army realized they were exposing soldiers to harmful chemicals when they repainted vehicles that had been redeployed from Europe. The paint used is called "CARC" paint, for "chemical agent resistant coating". It is impervious to chemical weapons and can be cleaned of those agents. It is essentially a polyurethane paint and the health hazard arose from the use of hardeners needed for application. The Army has an ongoing project to develop non-hazardous CARC paint for use on Army vehicles. For now I believe it is still experimental, but I believe they are close. Will it be expensive? Probably, and of course the Army isn't too concerned about maintaining a high gloss, but it's worth watching to see what the future of painting will be. Try a Google search on "non hazardous carc paint".

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Mark

07-29-2003 09:37:28




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 Re: Re: painting with hardner/using air supply in reply to CNKS, 07-22-2003 18:30:18  
You should use a supplied air respirator with any paint containing isocyanates. I built one out of a wooden box, a bathroom fan, and a hose supplied to a hood. Works well.



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Slowpoke

07-22-2003 23:34:45




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 Re: Re: painting with hardner/using air supply in reply to CNKS, 07-22-2003 18:30:18  
I think the reason to not use a standard air compressor for breathing is that the air contains oil from the lubrication of the compressor piston walls.
When I used to do shallow water diving I had a diaphram compressor with a hose to the regulator which is held in the mouth. Diaphram compressors use no oil.
The compressor and a 5 hp engine was mounted on a large inner tube which floated on the surface. I could stay under water as long as the engine ran.
That outfit was stolen, but I recently found a like compressor at a yard sale for $5. It was missing the intake filter, so I modified it to use an air filter housing and a 30727 filter from a Tecumpseh 3hp engine. ($15 at a scooter shop.) When I get my sandblasting and painting equipment set up I'll use the compressor to provide breathing air to a hood. It should work above water as well as below.

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