<br><font size=2 face="sans-serif">Robert</font>
<br>
<br><font size=2 face="sans-serif">Humidity is not a problem, dew point
is. Since it is warm now in most places this should not be a problem. The
amount of reducer called out by the paint manufacturer has two purposes,
</font>
<br>
<br><font size=2 face="sans-serif">1. Reduce the viscosity so a standard
paint gun can atomize</font>
<br><font size=2 face="sans-serif">2. Only reduce the viscosity barely
enough as to meet EPA volatile organic emmision requirements </font>
<br>
<br><font size=2 face="sans-serif">The PPG "reducer" amounts
allow the car painting guy to seriously "lay it on" with out
fear of runs or overspray. Unfortunately laying it on an airplane increases
weight. A thicker clear coat will not really protect your plane better
than a thinner coat, so it is just weight. Adding more reducer (its really
a blend of different solvents) will allow for thinner coats, less
overspray, but can increase runs. </font>
<br>
<br><font size=2 face="sans-serif">The reducer like I mentioned is a blend
of solvents, and all of this 100% evaporates and has nothing to do with
the urethane chemical reaction that cures the clearcoat. You can add as
much reducer as you want without reprisal...except from the EPA, which
I doubt will go after an individual pattern guy...but I could be wrong.
So once you are comfortable with increasing your local pollution
level...add that 200% reducer!!!</font>
<br><font size=2 face="sans-serif"><br>
<br>
<br>
Gray Fowler<br>
Senior Principal Chemical Engineer<br>
Radome and Composites Engineering<br>
Raytheon</font>
<br>
<br>
<br>
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<td width=40%><font size=1 face="sans-serif"><b>"Robert Mairs"
<robertm@sssnet.com></b> </font>
<br><font size=1 face="sans-serif">Sent by: nsrca-discussion-bounces@lists.nsrca.org</font>
<p><font size=1 face="sans-serif">07/12/2006 05:42 AM</font>
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<div align=center><font size=1 face="sans-serif">Please respond to<br>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">[NSRCA-discussion] paint</font></table>
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<br>
<br><font size=2><tt>Couple of painting questions.<br>
<br>
Weathers turned to crap around here again. How much humidity is to
humid to <br>
paint?<br>
<br>
I've been reading where the jet guys are reducing they're clear coat to
a <br>
200% ratio. They think it's great. Anybody tried this? <br>
<br>
<br>
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