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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>By lightly sanding the wood after an application
of hairspray you would be exposing the higher wood grain to the glue. <span
class=GramE>Thus creating enough bonding surface for the glue to adhere to.</span><span
style='mso-spacerun:yes'> </span><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>So far no problems as proven by you this
weekend with your 45 degree climbing 80mph full power on <span class=SpellE>Mintor</span>
1.70 outside snap that didn’t slow down that you would never do in any
regular routine move stress test.<span style='mso-spacerun:yes'> </span>Wings
and tube did just fine…didn’t they?<o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>WG<span style='mso-spacerun:yes'>
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style='font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> discussion-request@nsrca.org
[mailto:discussion-request@nsrca.org] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Gray E Fowler<br>
<b><span style='font-weight:bold'>Sent:</span></b> </span></font><st1:date
Month="10" Day="4" Year="2004"><font size=2 face=Tahoma><span style='font-size:
10.0pt;font-family:Tahoma'>Monday, October 04, 2004</span></font></st1:date><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> </span></font><st1:time
Hour="8" Minute="31"><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>8:31 AM</span></font></st1:time><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>To:</span></b> </span></font><st1:PersonName><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>discussion@nsrca.org</span></font></st1:PersonName><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: Applying poly glue-a
different opinion</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><br>
</span></font><font size=2 face=sans-serif><span style='font-size:10.0pt;
font-family:sans-serif'>When using the current polyurethane glues for skins I
think there are a couple important things to consider. From what I have read on
the list, there are several things being offered up that I kind of disagree
with and I will say why. First, the THIS polyurethane does require
moisture to cure, but remember-gaseous water , that is humidity. I am not
so sure where the threshold is but I am sure that if you are about 40% RH you
should be fine. Spraying/wiping the wings with water is really excessive
as most of that will never evaporate in time to do any good, and what you will
have is a wet wing. I would suggest that if you gotta do it, do the foam, be
sparing, as the balsa has plenty of moisture in it...unless you live in the
western US (or the outback -Tom) where RH is very low ...like 10-15%.
</span></font><br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>Second,
I have alway disliked the hair spray idea because the bond between adhesive and
balsa can now be seriously degraded by humidity. Remember that hairspray is
water soluble, cuz if not one application would do for life.....without getting
into too much detail...humidity degradtion of bond joints is serious, and now
using hairspray just creates a real weak link over time.</span></font> <br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>Also-the
hairspray idea I think originated when most were using epoxy, and it would soak
into the balsa requiring excessive amounts to adquately bond the skins. With
this urethane that expands, it fills the bond line very well. and the viscosity
increase is so great that alot is not going to soak into the wood, AND you want
that anyway for a better bond. Adding HS will just give you a weaker bond, with
the added weight of the HS itself.<br>
<br>
<br>
<br>
Gray Fowler<br>
Principal Chemical Engineer<br>
Composites Engineering</span></font><o:p></o:p></p>
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