[NSRCA-discussion] paint(and E exhaust)

[Gray E Fowler]

Wow-that actually makes sense. Good thing I never thought you were nuts.



Gray Fowler
Senior Principal Chemical Engineer
Radome and Composites Engineering
Raytheon



"Richard Strickland" <richard.s at allied-callaway.com> 
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07/13/2006 09:34 AM
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Re: [NSRCA-discussion] paint(and E exhaust)






Since it has happened in pulls and pushes on hot humid days, I’m assuming 
it may have something to do with prop cavitation with the larger dia. 
props.  I quit using mind-altering substances in ’89 after my share ran 
out.  Was a lot easier to get ‘in’ to Monocoting and masking in those 
days…..Dude(s).
 
RS
 
-----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 3:12 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] paint(and E exhaust)
 

Richard-you are fine, nothing wrong here. 

(Wayne-O,,,,,good thing this guys not in our district) 



Gray Fowler
Senior Principal Chemical Engineer
Radome and Composites Engineering
Raytheon 


"Richard Strickland" <richard.s at allied-callaway.com> 
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07/12/2006 02:51 PM 


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Re: [NSRCA-discussion] paint(and E exhaust)
 


 
 




Speaking of electric battery exhaust—and I know you guys are going to 
think I’ve lost it—very occasionally I could swear I’ve seen a bit of some 
kind of trailing ‘exhaust’ looking vapor on my electrics.  Has anyone else 
experienced that (and will admit it) or have I just lost my mind? again. 
  
RS 
  
-----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 1:14 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] paint 
 

Tim 

I am unaware of Imron properties. Clear coat is a protection for some 
systems that are not fuel proof and for pigmented car systems that 
absolutely require a reactive clear coat. I do not trust that a paint shop 
person is aware of the nitromethane chemical resistance of Imron. Pehaps 
someone on this list does know. 

Single stage paints, such as PPG DBU etc are a non reactive carrier resin 
pigmented with a color and fillers. They basically "dry" or evaporate a 
solvent and what is left behind is the non reacted resin and color. 
Clearcoats are reactive, which is a thermosetting polymer-non reversable. 
Single stage paints dry and then can be removed with a slovent wipe, or 
fuel on your plane. 

But! it is important tp point out that single stage paints are not 
affected by electric battery exhaust, except for the occasional unbalanced 
cell act. 



Gray Fowler
Senior Principal Chemical Engineer
Radome and Composites Engineering
Raytheon 

"Tim" <twortkoetter at yahoo.com> 
Sent by: nsrca-discussion-bounces at lists.nsrca.org 
07/12/2006 10:39 AM 
 


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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> 
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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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