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Old 10-17-2008, 12:51 AM
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Respirator questions

What is the recommended respirator setup for painting? I was planning on using a mask with organic vapor cartridges for spraying epoxy primer, but what should I use for 2 part urethane primer? I'll be painting in an open carport as I'm not too worried about dust at this point. What would be the best system and, hopefully, not terribly expensive?

If there are any chemist/scientist people here, I'm curious as to why organic vapor masks don't filter out isocyanates...the warning labels say not for use with isos.

Thanks, Scot

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Old 10-17-2008, 07:05 AM
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Many prior threads on this which can be found using the Search function near the top of this page.

I use this system which runs around $400 plus about another $100 for full body paint suit, booties, gloves etc. etc. More info on the air system here. If I was painting every day I'd consider even a better, more expensive unit. This is pretty much the next step above the canister type mask that you mentioned. I really like mine (once you get used to wearing the full head "hood".) No smells, no headaches, no tipsy feeling during or after shooting. So far I've saved 375,294 brain cells using this unit which, unfortunately, still leaves my I.Q. at about my shoe size.

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Old 10-17-2008, 07:17 AM
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The only way to prevent from inhaling isocyanates is a fresh air supplied system. for epoxy primer a organic vapor mask will bo ok because isocyanates are only found in clear, but if you do a lot of spraying you should get a fresh air supplied system.
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Old 10-17-2008, 09:13 AM
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With that much open air, a fresh air respirator will get you by. Spend the dough and get the fresh air, but in a pinch the respirator will be ok.

The biggest thing that killed the respirator is "fit". Too many guys with beards and such where the thing didn't fit well. The other thing is not servicing the cartrigages and prefilters.

The other thing is in an inclosed area full of paint, there just isn't enough oxygen, but in a car port, that isn't a problem.

Brian
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Old 10-17-2008, 09:47 AM
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Given that you will be spraying in an open carport, proper ventilation is not an issue. A good organic vapor respirator with NEW cartridges will do just fine. The literature advising that the organic vapor cartridges do not protect against isocyanate's is for all practical purposes an insurance disclaimer. Isocyanate's will saturate organic vapor cartridges very quickly if proper ventilation is not provided however, and you will not smell them at dangerous levels. I cannot stress enough to use new cartridges and make sure the mask fits your face properly. Also be advised that inhalation is not the only thing you need to worry about. Isocyanate's can absorb through un-protected skin. At the very least wear a long sleeve shirt and use protective gloves.

Vince
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Old 10-18-2008, 02:23 AM
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Thanks for the input, guys! I'll go pick up some new cartridges for my mask. I do believe in buying good tools and the proper tools for doing the job right and safely, but $400+ is fairly steep for the amount of painting I need to do. I will have the base/color done at a shop, I'm only doing the body work (or at least attempting to) and the primer.

Any idea on how long a cartridge will last or how to tell when it's done?
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Old 10-18-2008, 02:40 PM
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Quote:
Originally Posted by ScotY

Any idea on how long a cartridge will last or how to tell when it's done?
No real clear guidelines on that. As I stated, the iso's will saturate the activated carbon long before you notice the smell or the reduction in air flow. Safest bet is to use a new set every paint session. When not in use store them in a heavy Ziploc freezer bag.

Vince
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Old 10-19-2008, 11:08 PM
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And store the pre-filters in a seperate bag. The isos in the still curing paint on the pre-filter will be absorbed by the cartrige.

Brian
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Old 10-19-2008, 11:10 PM
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Awesome...thanks, guys!
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Old 10-20-2008, 12:21 AM
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And I can't make this clear enough, it MUST fit you properly. NO facial hair can be on the seal. If there is any, I am sorry, you have to shave. One of the tests is to cover the filer intakes with your hands and inhale, the mask should suck down to your face. If you lightly blow while covering the exhale valve the mask should blow up like a ballon on your face without letting air excape.

Brian
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Old 10-20-2008, 06:41 AM
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I use a small amount of vaseline around the contact area to help the mask seal.
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Old 10-22-2008, 12:41 AM
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Got it...no facial hair. I will shave then.

I think I may buy a new mask. I tried the one I have on and it doesn't really fit all that great. It's an AO Safety mask...the kind you get from Home Depot. It wasn't cheap, but I'm thinking it might not be the best? Any recommendations?
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