<br><font size=2 face="sans-serif">Bob</font>
<br>
<br><font size=2 face="sans-serif">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 size=2 face="sans-serif">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 size=2 face="sans-serif"><br>
<br>
<br>
Gray Fowler<br>
Principal Chemical Engineer<br>
Composites Engineering</font>
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<td width=40%><font size=1 face="sans-serif"><b>Bob Kane <getterflash@yahoo.com></b>
</font>
<br><font size=1 face="sans-serif">Sent by: discussion-request@nsrca.org</font>
<p><font size=1 face="sans-serif">10/20/2005 02:51 PM</font>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">discussion@nsrca.org</font>
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<div align=right><font size=1 face="sans-serif">cc</font></div>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">PPG Concept curing question</font></table>
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<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>
<br>
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