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<DIV><FONT face=Arial size=2>Gray actually explains a useful characteristic of
Concept. Spray a base coat, say all white, and allow this to
<U>cure</U> for a couple of days. Then mask and spray trim color(s) and allow to
<U>dry</U> for a few hours. Trim color migrations via tape / mask
leaks can now easily be wiped off with a mild solvent (I use degreaser)
without damage to the cured base. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Earl</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=gfowler@raytheon.com href="mailto:gfowler@raytheon.com">Gray E
Fowler</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=getterflash@yahoo.com
href="mailto:getterflash@yahoo.com">Bob Kane</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> ; <A
title=discussion-request@nsrca.org
href="mailto:discussion-request@nsrca.org">discussion-request@nsrca.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, October 20, 2005 3:22
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: PPG Concept curing
question</DIV>
<DIV><BR></DIV><BR><FONT face=sans-serif size=2>Bob</FONT> <BR><BR><FONT
face=sans-serif size=2>Dry and cure are different terms. Paints "dry" which
means that the paint resin is a solid at RT and it is cut in a solvent. When
the solvent evaporates, a dry film of resin, pigment and filler is left
behind. The Concept resin is exactly the same...BUT the finished product
adds a isocyanate curing agent which actually crosslinks the resin polymer.
PPG Concept drys first to the touch then continues to crosslink react or
"cure". The stuff that is dry in the can just had the solvent
evaporate.</FONT> <BR><BR><FONT face=sans-serif size=2>Try this
experiment.....mix the Concept per the instructions, spray your enitre plane.
After it is "dry" (1/2 hour) wipe your plane with acetone-it will wipe off.
Spray your entire plane a second time but let the Concept dry AND cure then
wipe it with acetone.....and it will remain. You can do this with a test
coupon instead of using your plane, but the results are not as
rewarding.</FONT> <BR><FONT face=sans-serif size=2><BR><BR><BR>Gray
Fowler<BR>Principal Chemical Engineer<BR>Composites Engineering</FONT>
<BR><BR><BR>
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<TD width="40%"><FONT face=sans-serif size=1><B>Bob Kane
<getterflash@yahoo.com></B> </FONT><BR><FONT face=sans-serif
size=1>Sent by: discussion-request@nsrca.org</FONT>
<P><FONT face=sans-serif size=1>10/20/2005 02:51 PM</FONT> </P>
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<DIV align=right><FONT face=sans-serif size=1>To</FONT></DIV>
<TD><FONT face=sans-serif size=1>discussion@nsrca.org</FONT>
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<TD>
<DIV align=right><FONT face=sans-serif size=1>cc</FONT></DIV>
<TD>
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<TD>
<DIV align=right><FONT face=sans-serif size=1>Subject</FONT></DIV>
<TD><FONT face=sans-serif size=1>PPG Concept curing
question</FONT></TR></TBODY></TABLE><BR>
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<TD></TR></TBODY></TABLE><BR></TR></TBODY></TABLE><BR><BR><BR><FONT
size=2><TT>I am using PPG Concept (DCC) paints for the first<BR>time. I had
innocently assumed since this was a<BR>two-part paint, it cured much like
epoxy. But after<BR>working the stuff for a couple of weeks I noticed
the<BR>unmixed paint in the empty cans was "dry". So, my<BR>assumption
is the paint will "dry" on it's own, but<BR>would not have the durability of
properly mixed paint?<BR>The hardener gets all the molcules link arms and
form<BR>a tougher material? Thanks in advance.<BR><BR>Bob
Kane<BR>getterflash@yahoo.com<BR><BR><BR>
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