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Antique Tractor Paint and Bodywork

Isocyanates, Painting by Brush

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Jim/41_9N

09-26-2003 12:14:22




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Isocyanates

I’ve been reading archives of this forum for a couple of weeks now (I have been a member of the “N” board for several years) and have a question about isocyanates. I have been restoring my Front End Loader mechanically, and now before I re-install it on my 9N, I want to paint it. The FEL is approximately 90% rust. I want to wire brush it, and use POR-15. After checking out their website, I see the prep that is required. After the POR-15 is applied, I plan on using their Tie-Coat primer. Then I was considering using their Hardnose Paint, as a topcoat. This Hardnose paint is a two-part paint with one part being a hardener. This, I believe, is where isocyanates come into play. I have read all the warnings about spraying paint with hardeners. I plan on brushing this paint on, so do the same concerns apply? I’m not looking for a professional smooth paint job. I just want to stop the FEL from rusting more, and to topcoat the POR-15. Their hardnose paint seems like a good product, I’m just concerned for my safety. Thanks in advance for any input.

Jim

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Quentin

09-26-2003 21:08:59




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 Re: Isocyanates, Painting by Brush in reply to Jim/41_9N, 09-26-2003 12:14:22  
I spray painted equipment with polyurethane for the USAF for three years out of my 17 on active duty. I have sprayed 1:1, 2:1, 3:1, and 2:5 (color to hardner) mixture ratios. According to AFOSH (air force occupational safety and health standards) which is based on and used in conjunction with OSHA, as soon as you open the can, you have to be on a forced air respirator system. We are not even allowed to have spray cans with isocyanates in it even in a well ventilated area. The problem with isocyanates is that everyone is affected differently. People can become sensitized or desensitzed to it. For example, when I smell isocyanates, I become hungry and I mean flat starving to death. If I should come into contact with it and not have that happen, I have become densitized to it and should not be exposed to it without protection. As for the Air Force, desensitization usually means transfer into another career field. Acrylic Urethane, which is the consumer version of polyurethane can contain iso's as well. There is also an inherent hazard when you sand polyurethane as the dust still can contain the stuff. I'm not trying to scare you, only pass on what I know. Sorry to be long winded. Hope this helps you.
Quentin
B-52's ROCK!

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CNKS

09-27-2003 05:32:15




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 Re: Re: Isocyanates, Painting by Brush in reply to Quentin, 09-26-2003 21:08:59  
Never really thought about the dust, could be a problem, as you say. I don't know if the iso's are volaltile after the stuff dries or not. I'm not a chemist. The surface is usually wet sanded, which means no dust, there will still be some odor.



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Quentin

09-27-2003 17:02:39




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 Re: Re: Re: Isocyanates, Painting by Brush in reply to CNKS, 09-27-2003 05:32:15  
Good point. Wet sanding should do a really good job of keeping the dust down. Didn't think of that, but then again, we didn't wet sand either.



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CNKS

09-26-2003 18:18:29




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 Re: Isocyanates, Painting by Brush in reply to Jim/41_9N, 09-26-2003 12:14:22  
There is a post by Red Dave below, that links to the OSHA web site. Like most govt. publications it is somewhat hard to read. My interpretation (and ONLY my interpretation) is the type of protection you need depends on the envionrment you are in, and how long you are exposed. Not sure, but I think some pro body shops use only cartridge respirators, because they have downdraft paint booths that remove most of the fumes, including iso's. Hobby painters don't have that luxury so positive air supply respirators are necessary. You are using a brush, so you don't have the vapors floating all around, but it's going to take you a long time to use a brush. If you were only touchup painting a few nuts and bolts with paint containing isos, a cartridge mask might be ok. I opened a can of old hardener today, just to look at it, as it is supposed to be used up in 2 weeks -- wanted to see what year-old hardener looked like. Odor was very strong, from just opening the can. I would not do it. I wouldn't try it -- only my opinion.

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