[NSRCA-discussion] paint

[Tim]

I am getting ready to spray imron.  I have never painted anything.  I
told the paint shop what I was using it for and they said I didn't need
a clear and I didn't get any reducer.  What type of reducer and how much
should I use for this type of paint.  Also why do you use clear over a
single stage paint.  
 
Tim
 
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Gray E
Fowler
Sent: Wednesday, July 12, 2006 8:17 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] paint
 

Robert 

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, 

1. Reduce the viscosity so a standard paint gun can atomize 
2. Only reduce the viscosity barely enough as to meet EPA volatile
organic emmision requirements 

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. 

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!!! 



Gray Fowler
Senior Principal Chemical Engineer
Radome and Composites Engineering
Raytheon 



"Robert Mairs" <robertm at sssnet.com> 
Sent by: nsrca-discussion-bounces at lists.nsrca.org 
07/12/2006 05:42 AM 

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[NSRCA-discussion] paint
 

 
 



Couple of painting questions.

Weathers turned to crap around here again.  How much humidity is to
humid to 
paint?

I've been reading where the jet guys are reducing they're clear coat to
a 
200% ratio.  They think it's great.  Anybody tried this? 


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