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<DIV><FONT size=2>My test with 5 minute expoxy and 70 % alcohol was a
disaster. 1 oz expoxy and 1 oz alcohol after curing only lost about a gram
in the cup. The mixture was a rubbery substance that crumbled when pressure was
applied. No strength at all. Spreading thin for the cure would have
lost more weight but probably not substantially. So, I no longer believe
the alcohol evaporates and you are only left with expoxy. The molecular
structure changes and not for the better. I'm not going to thin anything
that needs strength.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Don</FONT></DIV>
<DIV> </DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=getterflash@yahoo.com href="mailto:getterflash@yahoo.com">Bob
Kane</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, November 20, 2007 6:32
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Epoxy
Question</DIV>
<DIV><BR></DIV>
<DIV
style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">
<DIV></DIV>
<DIV>This reminds me of a workshop incident 29 years ago . . .
. I was making a spacer out of 5/8" particle board to put an
aftermarket aircleaner on my 1978 Chevy Monza. I decided to "fuelproof" the
spacer, but wanted to get it done in a hurry, so I mixed up a batch of 5
minute epoxy and thinned it quite a bit with alcohol. I painted the mixture on
the spacer and was waiting for it to cure, when all of a sudden an epoxy
"snake" started growing out of the mixing cup. It made kind of a hissing,
snapping sound, and grew to be about 8 inches long. I figured the epoxy
heated up enough to "boil" the epoxy while it was still somewhat pliable. The
result was an interesting honey colored rock hard piece of epoxy foam.
The epoxy on the particle board cured fine.<BR> </DIV>Bob
Kane<BR>getterflash@yahoo.com
<DIV
style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"><BR><BR>
<DIV
style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">-----
Original Message ----<BR>From: "patterndude@tx.rr.com"
<patterndude@tx.rr.com><BR>To: NSRCA Mailing List
<nsrca-discussion@lists.nsrca.org><BR>Cc: "Atwood, Mark"
<atwoodm@paragon-inc.com><BR>Sent: Tuesday, November 20, 2007 4:48:13
PM<BR>Subject: Re: [NSRCA-discussion] Epoxy Question<BR><BR>Mr Fowler is out
saving the world through explosives, but as a foot soldier in the cause,
here's my understanding (and experience):<BR>Alcohol and acetone both mix into
the resin/hardener solution. This makes is harder for crosslinking to
occur and it separates the epoxy molecules trapping the alcohol. THe
resulting solid will be a bit rubbery because of the trapped alcohol.
Acetone is a more powerful solvent than alchohol and is beter for cleaning and
thinning, but is also better for making rubber. <BR> The answer to
the original question is really somewhat obvious. Alcohol is volatile
and will evaporate from the surface of the liquid in your mixing cup. As
the epoxy cures, it exotherms (heats up) and this will also increase the
evaporation. However, not all will evaporate. Whatever doesn't
will be bound into the final rubbery solid. THe amount left behind is a
variable affected by the size of the cup, heat in the room, amount of epoxy
mixed, speed of cure, etc.<BR> The one time alcohol is OK to leave in
the mix is when glassing. The very thin layer allows virtually all the
alcohol to evaporate.<BR><BR>Also, Mike says he is using 91% alcohol.
That means 9% water. Water is never good. He should go to home depot and
buy a gallon of Denatured Alcohol. This is pretty close to 100% pure and
it is less than half the price.<BR><BR>--Lance<BR><BR>---- "Atwood wrote:
<BR><BR>=============<BR>Actually...my thought goes the other direction.
That if indeed the<BR>alcohol actually MIXES with the epoxy, then it would
truly bind and in<BR>some way harden as part of the overall mixture.
Epoxy "cures"...rather<BR>than flashing, so my guess...and it's truly a
guess...is that it would<BR>be much closer to the original total weight of 2
oz. <BR><BR><BR><BR>Still waiting patiently for our resident epoxy
deity, previously<BR>referred to as Master Fowler to take away the mystery and
lead us oh so<BR>graciously to the light...<BR><BR><BR><BR>From: <A
href="mailto:nsrca-discussion-bounces@lists.nsrca.org"
ymailto="mailto:nsrca-discussion-bounces@lists.nsrca.org">nsrca-discussion-bounces@lists.nsrca.org</A><BR>[mailto:<A
href="mailto:nsrca-discussion-bounces@lists.nsrca.org"
ymailto="mailto:nsrca-discussion-bounces@lists.nsrca.org">nsrca-discussion-bounces@lists.nsrca.org</A>]
On Behalf Of wgalligan<BR>Sent: Tuesday, November 20, 2007 9:52 AM<BR>To: Don
Ramsey; NSRCA Mailing List<BR>Subject: Re: [NSRCA-discussion] Epoxy
Question<BR><BR><BR><BR>OK, I'll take a stab. After the alcohol
evaporates you would have the<BR>same mass or weight of epoxy that you started
with. AND to reiterate<BR>what I learned from the Master Fowler,
thinning epoxy, if I remember<BR>right, changes the molecular structure
weakening the mixture. It will<BR>also cause the epoxy to shrink over
time. BTDT.<BR><BR><BR><BR>Wayne Galligan<BR><BR><BR><BR>waiting for Master to
speak<BR><BR> ----- Original Message -----
<BR><BR> From: Don Ramsey <mailto:<A
href="mailto:don.ramsey@suddenlink.net"
ymailto="mailto:don.ramsey@suddenlink.net">don.ramsey@suddenlink.net</A>>
<BR><BR> To: NSRCA Mailing List <mailto:<A
href="mailto:nsrca-discussion@lists.nsrca.org"
ymailto="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</A>><BR><BR><BR>
Sent: Tuesday, November 20, 2007 8:53 AM<BR><BR> Subject:
[NSRCA-discussion] Epoxy Question<BR><BR>
<BR><BR> Breaking news. Here's something from Mike
Harrison that will be<BR>of interest to the list.<BR><BR>
Don<BR><BR> <BR><BR>
<BR><BR> Ok, think about this, take 1 oz epoxy and thin with
1 oz alcohol<BR>(91%).? After curing how much do you think it weighs and
tell me why.<BR><BR> <BR><BR>
Mike<BR><BR>________________________________<BR><BR>
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