From: Charles.K.Scott@dartmouth.edu (Charles K. Scott)
Newsgroups: rec.aviation.homebuilt
Subject: Re: Painting strategies?
Date: 19 Nov 92 20:33:05 GMT
Organization: Dartmouth College, Hanover, NH
X-Posted-From: InterNews1.0a5@newshost.dartmouth.edu

Steve Cornelius sent me an E-mail message that added a lot of detail to
the message I posted about the danger of painting without proper
protection.  He suggested I post it if I thought it was important
enough and I do.  So in addition to Paul Burnetts posting which also is
important reading, here is the E-mail from Steve:


>>I saw your response to the painting question and thought I'd add a
>>couple of notes:

>Others have addressed the actual paint application and cost, I just
>wanted to mention a word of caution.  Using the high pressure spray
>guns creates a great deal of overspray.  The overspray hangs in the air
>in lethal concentrations for surprisingly long periods.  Urethane paint
>is *HIGHLY* toxic and has killed people who took improper precautions. 

>>Absolutely! We need to be *dead* serious about this stuff, it *will* mess
>>up an unprotected person.

>>Also, don't forget that the overspray "dust" that gets all over the floor
>>(and in some of the most amazing places!) is legally classified as a toxic
>>waste. Dispose of it according to local law....


>>There are 2 types of protections that you can use for vapors & overspray:

>>(1)
>>NIOSH-T19 Particle vapor masks - about 20 bucks for a good one. These are >>tight fitting masks that fit over the nose & mouth. They filter the >>overspray particles with prefilters, and have activated charcoal filters >>that remove much or most of e
VOC (Volatile Organic Compounds - thinners, >>esentially) vapors from
the air. Note: they have a limited useful life, if >>you can smell
thinner, it's time for a new one.

>>T19 masks are acceptable for:

>>Nitrate Dopes (Randolph, etc., these are just very thick lacquers, really)
>>Nitrate Lacquers (don't think anyone makes these anymore...)
>>Acrylic Lacquers (DuPont Lucite, Ditzler Duracryl, etc)
>>Acrylic Enamels
>>Epoxies (resins, primers, and finish coats)

>>(2)
>>NIOSH-T23 Positive pressure supplied-air systems - These are usually full
>>facemasks or even suits! They are supplied with a small air pump that is
>>installed *away* from the painting area with a clean fresh-air source.
>>They run 175 - 600 dollars (!). Of course, the serious homebuilder should
>>want to fabricate such a gadget (I'm in the process now...)

>>T23 systems are MANDATORY for:

>>Urethane Enamels     (Durathane, Ranthane.....)
>>Polyurethane Enamels (Imron, also any catalyzed poly clearcoat like DP >>580S)

>>Also, I prefer the forced-air systems for Epoxies (because of their >>potential as allergens), and for Zinc-Chromate primers (chromate is a >>carcinogen).

>>Catalyzed Polyurethanes should even be mixed/handled (not just sprayed) >>with a forced-air system because of the toxicity of the vapors!


>>Also, adding a couple of big squirrel cage blowers with filters to the >>paint shop will help a lot. Mount the blowers so that they draw in outside >>air, pass their output through a couple of furnace filters, and vent the >>pressure (on the other ed
of the room) out some one-way vents. This makes >>a *great* makeshift
spraybooth! One blower also helps to keep glue vapors >>down to a
minimum.

>>(Squirrel cage blowers can be found cheap in rusted-out eveporative >>coolers)

>>Doing this will not only clear the area fast, it will also result in a much
>>better paint job since overspray & dirt will be carried away instead of >>being left to settle in your paintwork :) The overspray residue stays in >>the exhaust filters, this is easier to dispose of.




>>Note: I didn't see the original posting. Pass or post if you think it's
>>useful.

>>Talk to you later (BTW, how are those fuel tanks coming along ?),

-- 

Steve Cornelius                     | If you *don't* like airplane
noise,
Phoenix, AZ, USA                    | then why in the #*!! did you buy
a
scornelius@ips.iacd.honeywell.com   | house next to an airport !!

Disclaimer: Any opinions are mine, Honeywell might have other ideas...
Newsgroups: rec.aviation.homebuilt