Wattflyer RC Network: RC Universe :: RCU Magazine :: RCU Forums :: RCU Classifieds :: RCU User Reviews :: RCU YouTube
Home Who's Online Calendar Today's Posts RealTime Post Spy Mark Forums Read
Go Back   WattFlyer RC Electric Flight Forums - Discuss radio control eflight > Electric R/C Airplanes > General Electric Discussions
Register Members List Wattflyer Extras Articles Search Today's Posts Mark Forums Read Social Groups

General Electric Discussions Talk about topics related to e-powered RC flying

Thank you for your support (hide ads)
Reply
 
Thread Tools Display Modes
Old 12-04-2012, 04:20 AM   #1
Beemerider
Member
 
Beemerider's Avatar
 
Join Date: Mar 2012
Location: Shenandoah Valley Of Virginia
Posts: 385
Thanked 9 Times in 9 Posts
Club: Augusta County RC Club
iTrader: (0)
Friends: (1)
Default Epoxy--new vs old?

Does 2-part epoxy have a shelf life? I've got some that's a few yrs old but unused. Still flows out of the bottles although the hardener half seems thicker than I remember it being. Any compromise in performance or strength vs a fresh set?
Beemerider is offline  
  Reply With Quote
Old 12-04-2012, 05:39 AM   #2
kyleservicetech
Dennis V
 
kyleservicetech's Avatar
 
Join Date: Apr 2008
Location: Wisconsin, USA
Posts: 7,418
Thanked 655 Times in 638 Posts
Club: www.racinercclub.com (I'm the newsletter editor)
Awards Showcase

Outstanding Contributor Award  3kW  2kW  100mph Speed Demon 
iTrader: (1)
Friends: (18)
Default

Originally Posted by Beemerider View Post
Does 2-part epoxy have a shelf life? I've got some that's a few yrs old but unused. Still flows out of the bottles although the hardener half seems thicker than I remember it being. Any compromise in performance or strength vs a fresh set?
Yeah
I've run across epoxy getting old and thicker than normal. For important glue joints, methinks it's safer to just replace it with new stuff.

(My CA and epoxy bottles are marked with the date when they were opened. CA definitely has a shelf life after being opened.)

DennyV
Retired and the days are just too short, busier than ever!
kyleservicetech is offline  
  Reply With Quote
Old 12-04-2012, 05:48 AM   #3
vonveska
Member
 
vonveska's Avatar
 
Join Date: Feb 2008
Posts: 101
View vonveska's Gallery9
Thanked 8 Times in 8 Posts
iTrader: (0)
Friends: (1)
Default

I think there is shelf life on epoxy products. From my experience epoxy older then one year tends to heat up when mixed and hardens quickly, resulting in brittle joints. I use few years old laminating epoxy and I dilute it with few drops of methyl to prevent quick setting. The strength is probably not 100% but still OK for non critical applications.

vonveska is offline  
  Reply With Quote
Old 12-04-2012, 12:15 PM   #4
Rodneh
Member
 
Join Date: Oct 2005
Location: Florida, USA
Posts: 702
Thanked 69 Times in 68 Posts
Club: Moonport Modelers
iTrader: (0)
Friends: (0)
Default

I am not sure about strength but I have had some epoxies that were over 20 years old (still have some of Hobby Poxy) and they still worked well. The Hobby Poxy (no longer available) that I still have is their "thicksotropic sp?" and it still works well. I also have several cans of their epoxy paints and frequently use them (I think that the presently available Klass Kote is the same product) with no change in how well they work.
Rodneh is offline  
  Reply With Quote
Old 12-04-2012, 02:25 PM   #5
Beemerider
Member
 
Beemerider's Avatar
 
Join Date: Mar 2012
Location: Shenandoah Valley Of Virginia
Posts: 385
Thanked 9 Times in 9 Posts
Club: Augusta County RC Club
iTrader: (0)
Friends: (1)
Default

Thanks for the replies. I have some new epoxy as well so I think I'll take Kyle's advice and relegate the older stuff to less critical stuff. I keep my all my ca products in an old coffee can with the lid on. Seems to help although I don't buy big bottles of any of this because I know it'll go bad before I can use it all.
Beemerider is offline  
  Reply With Quote
Old 12-04-2012, 02:42 PM   #6
solentlife
Super Contributor
 
solentlife's Avatar
 
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 5,176
View solentlife's Gallery47
Thanked 211 Times in 208 Posts
Club: Founder Member Ventspils RC Club. Ex Waltham Chase and Meon Valley Soaring.
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Outstanding Contributor Award  125mph Speed Demon 
iTrader: (0)
Friends: (8)
Default

Epoxy is quite tolerant of age .... but yes it does degrade with age but in our use ? The Epoxy is far stronger than we need.

The resin that does age badly though is Polyester - the Glass Fibre resin ... it often darkens with age ... cures poorly .... etc.

Nigel

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
- Subscribe my Youtube: "solentlifeuk"
solentlife is offline  
  Reply With Quote
Old 12-05-2012, 07:45 PM   #7
cyclops2
Super Contributor
 
Join Date: Dec 2005
Location: New Jersey
Posts: 1,955
Thanked 43 Times in 41 Posts
iTrader: (0)
Friends: (1)
Default

I find that a NON-TIGHT lid is a fast death for any type of glue / adhesive. OR even forgetting to close it for a day or 2. Gone.
cyclops2 is offline  
  Reply With Quote
Old 12-05-2012, 11:35 PM   #8
Beemerider
Member
 
Beemerider's Avatar
 
Join Date: Mar 2012
Location: Shenandoah Valley Of Virginia
Posts: 385
Thanked 9 Times in 9 Posts
Club: Augusta County RC Club
iTrader: (0)
Friends: (1)
Default

Originally Posted by cyclops2 View Post
I find that a NON-TIGHT lid is a fast death for any type of glue / adhesive. OR even forgetting to close it for a day or 2. Gone.
Seems slightly thick ca (medium) gets real thick quickly without careful storage. I've lightly heated the bottle (both ca and epoxy) in a microwave or careful application of a heat gun to get it thin enough to use after it has a little age on it. I only buy the very small bottles at a time as well unless I know it will be used quickly (seems I don't do anything quickly anymore except falling asleep!)

I try to keep all bottles tightly capped and also put those bottles in a coffee can with the lid on.
Beemerider is offline  
  Reply With Quote
Reply

  WattFlyer RC Electric Flight Forums - Discuss radio control eflight > Electric R/C Airplanes > General Electric Discussions

« Previous Thread | Next Thread »

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Foam safe Ca vs. epoxy!!! PBaiyre Foamies 27 07-05-2013 03:28 AM
MORE Problems ! Motor won't spin with prop on! ianfox ParkFlyers 29 10-28-2012 12:27 AM
#27 Model Airplane Building Clinic >> Mimi DLG 1 meter polyhedral<< aeroknot Hi-Performance and Sailplanes 94 10-23-2012 12:59 AM
gws slow stick how to biuld ? skom80 Beginners 3 06-20-2011 03:46 AM
I need strong dbl sided tape to mount servos... tehlump Scratch and Kit Built Aircraft 10 03-03-2011 09:01 PM


All times are GMT +1. The time now is 12:40 PM.


Powered by: vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 2005 WattfFlyer.com
RCU Eflight HQ

Charities we support Select: Yorkie Rescue  ::  Crohn's & Colitis Foundation



Page generated in 0.19730 seconds with 33 queries