KR> Aeropoxy Chameleon

[Matthew Elder]

Has anyone ever seen aeropoxy hardener turn deep red in color such that it 
changes the mix's color from amber to red?
Wondering what happened there.

Matt



- 
Matthew Elder 
Orangeburg, SC
  http://www.infinigral.com/melder 

My Airplane Project: 
http://www.infinigral.com/melder/flying/KR1/

KR> Aeropoxy Chameleon

[Mark Jones]

Yep, happens all the time, especially with aged hardener. It has
something to do with being exposed to oxygen. It does not affect the
properties and is still good to use. Some do not like to use it in
structural applications just to be on the safe side. However, I have
used it in many instances and have seen no adverse effects.

Mark Jones (N886MJ)
Wales, WI
Web site: www.flykr2s.com
Mailto:flyk...@wi.rr.com


-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On
Behalf Of Matthew Elder
Sent: Thursday, July 20, 2006 8:29 AM
To: KRnet
Subject: KR> Aeropoxy Chameleon


Has anyone ever seen aeropoxy hardener turn deep red in color such that
it changes the mix's color from amber to red?
Wondering what happened there.

Matt



- 
Matthew Elder 
Orangeburg, SC
  http://www.infinigral.com/melder 

My Airplane Project: 
http://www.infinigral.com/melder/flying/KR1/




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KR> Aeropoxy Chameleon

[Joseph H. Horton]

Matt,
Some where along the line I was told that it is from absorbing
moisture with age. I stopped using the stuff that had changed color for
anything structural and used it up for micro filler and such so it did
not go to waste. I do not know if it harms the integrity of the epoxy, I
just did not continue to use it because it didn'tseem right. I used West
Systems and am just guessing it would be the same cause.

Joe Horton, Coopersburg, PA.
joe.kr2s.buil...@juno.com

On Thu, 20 Jul 2006 06:29:05 -0700 (PDT) Matthew Elder
 writes:
> Has anyone ever seen aeropoxy hardener turn deep red in color such 
> that it changes the mix's color from amber to red?
> Wondering what happened there.
> 
> Matt

KR> Aeropoxy Chameleon

[Steve Bray]

It will not set up for me. It has stayed sticky for a week now. Called the 
people where I bought it and they gave me the # of the producer. I feel like 
its crap and I got ripped off. It must work for someone. I mixed it like it 
said ...four times. Could have been a bad batch but it won't happen to me 
agaim.

Steve Bray
Jackson, Tennessee




>From: "Joseph H. Horton" <joe.kr2s.buil...@juno.com>
>Reply-To: KRnet <kr...@mylist.net>
>To: eldo...@yahoo.com,kr...@mylist.net
>Subject: Re: KR> Aeropoxy Chameleon
>Date: Thu, 20 Jul 2006 10:05:38 -0400
>
>Matt,
> Some where along the line I was told that it is from absorbing
>moisture with age. I stopped using the stuff that had changed color for
>anything structural and used it up for micro filler and such so it did
>not go to waste. I do not know if it harms the integrity of the epoxy, I
>just did not continue to use it because it didn'tseem right. I used West
>Systems and am just guessing it would be the same cause.
>
>Joe Horton, Coopersburg, PA.
>joe.kr2s.buil...@juno.com
>
>On Thu, 20 Jul 2006 06:29:05 -0700 (PDT) Matthew Elder
><eldo...@yahoo.com> writes:
> > Has anyone ever seen aeropoxy hardener turn deep red in color such
> > that it changes the mix's color from amber to red?
> > Wondering what happened there.
> >
> > Matt
>
>___
>Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
>to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
>please see other KRnet info at http://www.krnet.org/info.html

KR> Aeropoxy Chameleon

[Don Chisholm]

If you're considering trying another brand of resin, have a look at MGS. Wicks 
and Aircraft Spruce carry it. It's a formulation designed in Europe for their 
Aerospace industry and is exclusively used in Diamond Aircraft (Katana). It's 
of very low toxicity, cure times are adjustable, has excellent wetout 
properties and is very user friendly. I've used a few different epoxys and this 
stuff is my favourite. It just works every time
Steve Bray <rsb...@hotmail.com> wrote:  It will not set up for me. It has 
stayed sticky for a week now. Called the 
people where I bought it and they gave me the # of the producer. I feel like 
its crap and I got ripped off. It must work for someone. I mixed it like it 
said ...four times. Could have been a bad batch but it won't happen to me 
agaim.

Steve Bray
Jackson, Tennessee




>From: "Joseph H. Horton" 
>Reply-To: KRnet 
>To: eldo...@yahoo.com,kr...@mylist.net
>Subject: Re: KR> Aeropoxy Chameleon
>Date: Thu, 20 Jul 2006 10:05:38 -0400
>
>Matt,
> Some where along the line I was told that it is from absorbing
>moisture with age. I stopped using the stuff that had changed color for
>anything structural and used it up for micro filler and such so it did
>not go to waste. I do not know if it harms the integrity of the epoxy, I
>just did not continue to use it because it didn'tseem right. I used West
>Systems and am just guessing it would be the same cause.
>
>Joe Horton, Coopersburg, PA.
>joe.kr2s.buil...@juno.com
>
>On Thu, 20 Jul 2006 06:29:05 -0700 (PDT) Matthew Elder
> writes:
> > Has anyone ever seen aeropoxy hardener turn deep red in color such
> > that it changes the mix's color from amber to red?
> > Wondering what happened there.
> >
> > Matt
>
>___
>Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
>to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
>please see other KRnet info at http://www.krnet.org/info.html



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KR> Aeropoxy Chameleon

[Pitts Eric MSgt 181FW/MXOO]

"It will not set up for me. It has stayed sticky for a week now."



How humid is it in your area? Has been real bad here and that will affect
your setup time. We have been running in the 90 deg and 90 % 



Eric Pitts

KR2S

Terre Haute Indiana

KR> Aeropoxy Chameleon

[Dan Heath]

I used it for the majority of this airplane and never had a problem with it.


See N64KR at http://KRBuilder.org - Then click on the pics 
See you in Mt. Vernon - 2006 - KR Gathering
There is a time for building and a time for FLYING and the time for building
is OVER.
Daniel R. Heath - Lexington, SC
"It will not set up for me. It has stayed sticky for a week now."

KR> Aeropoxy Chameleon

[larry severson]

At 09:54 AM 7/20/2006, you wrote:
>It will not set up for me. It has stayed sticky for a week now.

The mixture ratios for ANY epoxy must be EXACT. I suggest that your 
mixture ratio is off.


Larry Severson
Fountain Valley, CA 92708
(714) 968-9852
lar...@socal.rr.com 

KR> Aeropoxy Chameleon

[AUnderwood]

Hay guys. I had the same problem and have had it off and on several times. How 
humid is it? I called aeropoxy and they said to try one trick. Take a rag and 
put MEK on it and and lighty wipe the surface. When it won't get hard because 
of mosture its called blushing. I don't know if age has anything to do with it. 
But call them to be sure or try a spot thats not important. One thing i found 
that works good is to build a tent over whatever your working on after the 
layup and put one of thoes electric oil filled radiator heaters under the tent. 
No open flame and you can regulate the temp. I've hade it up over a 100 
degrees. The aeropoxy people said the hotter its cured the more restant it is 
to heat after its cured.Anyway hop that helps.

-Original Message-
>From: larry severson <lar...@socal.rr.com>
>Sent: Jul 20, 2006 6:42 PM
>To: KRnet <kr...@mylist.net>
>Subject: Re: KR> Aeropoxy Chameleon
>
>At 09:54 AM 7/20/2006, you wrote:
>>It will not set up for me. It has stayed sticky for a week now.
>
>The mixture ratios for ANY epoxy must be EXACT. I suggest that your 
>mixture ratio is off.
>
>
>Larry Severson
>Fountain Valley, CA 92708
>(714) 968-9852
>lar...@socal.rr.com 
>
>
>___
>Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
>to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
>please see other KRnet info at http://www.krnet.org/info.html

KR> Aeropoxy Chameleon

[Martindale Family]

I thought MEK was used for polyester resins not epoxies but hey if it 
works!??  I used an electric blanket over a plastic sheet on my layups when 
necessary...wife wasn't amused.

John Martindale
29 Jane Circuit
TOORMINA NSW 2452
AUSTRALIA

phone:  61 2 66584767 (H)
 61 2 66869094 (W)
mobile:  0417 584767
email:johnja...@optusnet.com.au
web: www.members.optusnet.com.au/johnjanet/Martindale.htm

- Original Message - 

snip

> Hay guys. I had the same problem and have had it off and on several times. 
> How humid is it? I called aeropoxy and they said to try one trick. Take a 
> rag and put MEK on it and and lighty wipe the surface. 

KR> Aeropoxy Chameleon

[Steve Bray]

You got it MSgt. , I'm in Tennessee and that stands to reason.

Steve Bray
Jackson, Tennessee




>From: Pitts Eric MSgt 181FW/MXOO <eric.pi...@interr.ang.af.mil>
>Reply-To: KRnet <kr...@mylist.net>
>To: kr...@mylist.net
>Subject: KR> Aeropoxy Chameleon
>Date: Thu, 20 Jul 2006 13:38:04 -0400
>
>"It will not set up for me. It has stayed sticky for a week now."
>
>
>
>How humid is it in your area? Has been real bad here and that will affect
>your setup time. We have been running in the 90 deg and 90 %
>
>
>
>Eric Pitts
>
>KR2S
>
>Terre Haute Indiana
>
>
>
>
>
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>Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
>to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
>please see other KRnet info at http://www.krnet.org/info.html

KR> Aeropoxy Chameleon

[D F Lively]

Larry:

Underwood may be shooting you straight.

When I worked for AeroJet in Sacramento they were winding 2nd stage "Peace 
Keeper" motor cases with "Pre-preg Kevlar Filament Roving"   The most importent 
reguirement was that it be conditioned in a 20% RH environment after being 
prepreged with Resin because moisture levels above that lead to delaminations 
in the wound cases.. That ment a humidity controled environment which was very 
expensive to do with refrigeration.   I inquired as to what the maximum 
temperature was that the roving could be continuously exposed and was told 150 
Deg. F.   I determined that in Sacramento if it were stored at 135 Deg. F we 
could keep it below 20% RH. because the 99% design wet bulb was 71 Deg. (if I 
remember right in Sacramento)  We had to control the
absolute humidity in the winding area to 63 gr. of water per lb of air and the 
winding was heated to with "Heat Lamps" to a point where the resin matrix was 
activated and the roving would bond together.  I am not  knowledgeable of  the 
system details as much of it I think was classified and may still be.

So  in short humidity levels can have a huge impact on composit resin behavior.

In short I suspect what  A. Underwood says may well be true and his anecdotal 
evidence seems to bear him out.

Don
Burlington, IA


AUnderwood wrote:

> Hay guys. I had the same problem and have had it off and on several times. 
> How humid is it? I called aeropoxy and they said to try one trick. Take a rag 
> and put MEK on it and and lighty wipe the surface. When it won't get hard 
> because of mosture its called blushing. I don't know if age has anything to 
> do with it. But call them to be sure or try a spot thats not important. One 
> thing i found that works good is to build a tent over whatever your working 
> on after the layup and put one of thoes electric oil filled radiator heaters 
> under the tent. No open flame and you can regulate the temp. I've hade it up 
> over a 100 degrees. The aeropoxy people said the hotter its cured the more 
> restant it is to heat after its cured.Anyway hop that helps.
>
> -Original Message-
> >From: larry severson <lar...@socal.rr.com>
> >Sent: Jul 20, 2006 6:42 PM
> >To: KRnet <kr...@mylist.net>
> >Subject: Re: KR> Aeropoxy Chameleon
> >
> >At 09:54 AM 7/20/2006, you wrote:
> >>It will not set up for me. It has stayed sticky for a week now.
> >
> >The mixture ratios for ANY epoxy must be EXACT. I suggest that your
> >mixture ratio is off.
> >
> >
> >Larry Severson
> >Fountain Valley, CA 92708
> >(714) 968-9852
> >lar...@socal.rr.com
> >
> >
> >___
> >Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
> >to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> >please see other KRnet info at http://www.krnet.org/info.html
>
> ___
> Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> please see other KRnet info at http://www.krnet.org/info.html

KR> Aeropoxy Chameleon

[Mark Langford]

D F Lively wrote:

>>When I worked for AeroJet in Sacramento they were winding 2nd stage "Peace
Keeper" motor cases with "Pre-preg Kevlar Filament Roving"   The most
importent reguirement was that it be conditioned in a 20% RH environment
after being prepreged with Resin because moisture levels above that lead to
delaminations in the wound cases..<<

The problem with Kevlar layups absorbing moisture is a Kevlar problem, not
an epoxy problem. That kind of moisture absorbtion has caused delamination
of Kevlar parts on airliners due to freezing, and hence, it's fall from
grace in even non-structural parts in the aviation industry.   Don't even
get me started on Kevlar.  Although it makes a dandy bulletproof vest, it
has virtually no use on aircraft.

I've been using some dark red Aeropoxy hardener for years now, and see no
difference in the new amber stuff.  If you can't get that stuff to harden in
98F degree weather, there's a real problem somewhere.  I lay up glass or CF
using Aeropoxy in the morning, leave it in the high humidity 110 degree
hangar, and fly it and/or sand it later in the afternoon...

Mark Langford, Huntsville, Alabama
see KR2S project N56ML at http://home.hiwaay.net/~langford
email to N56ML "at" hiwaay.net
--