sticky epoxy    Gallery
View related threads: (in this forum | in all forums)

Logged in as Guest



Users viewing this topic: none
    Search This Thread  
 
Printable Version

All Forums >> RC Airplanes >> Questions and Answers >> sticky epoxy
Page: [1] 2   next >   >>  

Tower Hobbies Get Coupon Codes Brands  
Login
Message << Older Topic   Newer Topic >>
sticky epoxy - 1/18/2012 10:21 PM   
SCOTT42


 

Posts: 518
Score: 105
Joined: 1/21/2008
Last Login: 5/21/2013
From: Arlington, TX, USA
Status: offline 		I mixed up some epoxy last week and fiber glassed a wing section with it, as of today its still just a bit sticky when you touch it. The only thing I can think that I done wrong was get the mix wrong with less hardner.Is there anything I can do to get this thing to set good and hard? It is hard but just tacky still, allso since I had some of this mix left over I went ahead and fuel proofed my firewall with it so now my firewall is tacky too. Thanks Scott

_____________________________

Cub brotherhood #113

Hide Signatures
       Post #: 1

RE: sticky epoxy - 1/18/2012 10:30 PM   
Gray Beard


 

Posts: 12551
Score: 314
Joined: 4/21/2003
Last Login: 5/22/2013
From: Hemderson, NV, USA
Status: offline 		Acetone will take care of the fire wall. You may have to pull the wing apart and remove the epoxy then a do over. If the epoxy isn't mixed up real well it tends to not set up too. If you messed up the 50/50 blend it can still set up with more time. I learned to not use a stick to mix my epoxy, I use small acid brushes and it blends it much better.

_____________________________

Drinking and driving are illegal, why do bars have parking lots
Daisy Air Guns, keeping kids off your lawn for 100 year

Hide Signatures

(in reply to SCOTT42)
       Post #: 2

RE: sticky epoxy - 1/18/2012 10:45 PM   
skeeter_ca



Posts: 933
Score: 121
Joined: 11/30/2005
Last Login: 3/6/2013
From: Yucaipa, CA, USA
Status: offline 		Did you use epoxy or fiberglass resin? What brand?

skeeter

_____________________________

"It is easier to ask for forgiveness than permission".

Hide Signatures

(in reply to Gray Beard)
       Post #: 3

RE: sticky epoxy - 1/18/2012 11:47 PM   
SCOTT42


 

Posts: 518
Score: 105
Joined: 1/21/2008
Last Login: 5/21/2013
From: Arlington, TX, USA
Status: offline 		Skeeter, it is the quik-cure brand 2 part epoxy, greybeard, no there is no need to pull the wing halfs apart, it is just a top layer of fiberglass around the wing, just from where the two halfs joined. So you say acetone? How if you mind me asking? just dip a rag in it then rub it on?

_____________________________

Cub brotherhood #113

Hide Signatures

(in reply to skeeter_ca)
       Post #: 4

RE: sticky epoxy - 1/18/2012 11:48 PM   
cutaway


 

Posts: 1009
Score: 125
Joined: 6/26/2007
Last Login: 3/6/2012
From: Lake Worth, FL, USA
Status: offline 		What's the ambient temperature? If its in a cold garage, it may take a while. I've mixed 2-part epoxy paints and had the excess still be good years later when warmed up if it was stored in the freezer.

I've seen really old epoxy take extended periods to harden too. I've got some 35 year old tubes of HobbyPoxy that still work but take about 10X longer to set than they did 35 years ago.

Hide Signatures

(in reply to skeeter_ca)
       Post #: 5

RE: sticky epoxy - 1/19/2012 1:10 AM  1 votes
blvdbuzzard



Posts: 2934
Score: 123
Joined: 6/16/2002
Last Login: 5/11/2013
From: high deserts, CA, USA
Status: offline 		Use a heat gun on it. Make it warm, not hot. It may setup after that. Go over it a few times and see how it is doing.


Buzz.

Hide Signatures

(in reply to cutaway)
       Post #: 6

RE: sticky epoxy - 1/19/2012 1:23 AM   
vicman



Posts: 9691
Score: 189
Joined: 12/8/2002
Last Login: 5/22/2013
From: Valdese, NC, USA
Status: offline 		And that is why I only use West Systems for fiberglass anymore. I had one too many experiences like yours.


_____________________________

Bigger Badder Meaner Faster!
Revver Brotherhood & NMPRA #41

Hide Signatures

(in reply to blvdbuzzard)
       Post #: 7

RE: sticky epoxy - 1/19/2012 1:44 AM   
Gray Beard


 

Posts: 12551
Score: 314
Joined: 4/21/2003
Last Login: 5/22/2013
From: Hemderson, NV, USA
Status: offline 		OK, Just use acetone on a rag, heat it up to soften it up and whipe it off. Well, rub it off. Still try the heat gun first like Buzz mentioned to soften it up and see if it hardens. I have never tried it but nothing tried nothing gained. Heat on epoxy works great to siften it up. If I need to remove things like servo mounts I just heat and remove. Cold temps does slow down cure time but not all that much. It's usually just not mixed up well enough or not close enough to that 50/50.

_____________________________

Drinking and driving are illegal, why do bars have parking lots
Daisy Air Guns, keeping kids off your lawn for 100 year

Hide Signatures

(in reply to vicman)
       Post #: 8

RE: sticky epoxy - 1/19/2012 2:44 AM   
SCOTT42


 

Posts: 518
Score: 105
Joined: 1/21/2008
Last Login: 5/21/2013
From: Arlington, TX, USA
Status: offline
quote:

ORIGINAL: vicman

And that is why I only use West Systems for fiberglass anymore. I had one too many experiences like yours.

Hey vic, what is the west systems? Ive never heard of it before.

_____________________________

Cub brotherhood #113

Hide Signatures

(in reply to vicman)
       Post #: 9

RE: sticky epoxy - 1/19/2012 3:50 AM   
speedracerntrixie


 

Posts: 2381
Score: 189
Joined: 6/7/2010
Last Login: 5/22/2013
From: San Jose, CA, USA
Status: offline 		Warm it up with a heat gun and peel it off. Heating it up will make it come off easily. Epoxy glue is not the right tool for this job. What you need is epoxy laminating resin. West systems was mentioned and is a good product. Epoxies really need to be mixed correctly and that means using as scale. Do a web search for West Systems epoxy and you will find it. Lots of places to order online. Scales can he found for around 20.00


Hide Signatures

(in reply to SCOTT42)
       Post #: 10

RE: sticky epoxy - 1/19/2012 4:27 AM   
Altered1


 

Posts: 234
Score: 106
Joined: 4/2/2011
Last Login: 5/21/2013
From: Melbourne, AUSTRALIA
Status: offline 		Scott

Google is your friend! 

http://www.westsystem.com/ss/

As the Epoxy reaction is exothermic, warming your mixture will make it easier to apply, can reduce bubbles and assist with kicking off the curing.   I always add just a touch more of the catalyst to ensure a solid set.  Mix very well as others have indicated.


Hide Signatures

(in reply to SCOTT42)
       Post #: 11

RE: sticky epoxy - 1/19/2012 4:48 AM   
speedracerntrixie


 

Posts: 2381
Score: 189
Joined: 6/7/2010
Last Login: 5/22/2013
From: San Jose, CA, USA
Status: offline
quote:

ORIGINAL: Altered1

Scott

Google is your friend! 

http://www.westsystem.com/ss/

As the Epoxy reaction is exothermic, warming your mixture will make it easier to apply, can reduce bubbles and assist with kicking off the curing.   I always add just a touch more of the catalyst to ensure a solid set.  Mix very well as others have indicated.




Adding more catalyst actually hurts you here



Hide Signatures

(in reply to Altered1)
       Post #: 12

RE: sticky epoxy - 1/19/2012 6:25 AM   
GREG DOE


 

Posts: 213
Score: 115
Joined: 7/15/2005
Last Login: 5/22/2013
From: , TN, USA
Status: offline 		Scott, Speedracerntrixie is dead on. You'll regret it if you don't just take it off. Use a heat gun.
Warm the cloth and resin until you can pull it off. (I hope it's not a foam wing) I rutinely salavage
crashed wings buy seperating them at the center section. Both Sky Raider wings that I'm flying
now were put together from two crashed wings (each). So heat will even soften properly cured
resin; yes polyester, or epoxy. I also highly recommend West Systems Epoxy. It's not cheap,
but it has never let me down, and I've probably used 20 gallons of the stuff. I just finished up a
part that is used in a wind tunnel, and is going to Sweden. This is the 6th one I've made in the last
9 years, and they were all made with West Epoxy. There are lots of good epoxy, and probably you
made a mistake in measuring or mixing. If you plan to use the same epoxy again do a test sample
where you are certain that you did it right. Here is another tip. Most epoxies benefit form
"post curing" at an elevated temperature. Usually the resin manufacturer's literature will tell you
numbers. If for example you cure it at room temperature, and later on it sits in the sun, it might
soften. But if you cure it at say 125 deg. it will tolerate higher temperatures without softening.
This is one reason why people who make epoxy glass parts cure them in a low temperature oven.
the other reason is it speeds up the manufacturing process. Good luck, Greg


Hide Signatures

(in reply to SCOTT42)
       Post #: 13

RE: sticky epoxy - 1/19/2012 6:44 AM   
GREG DOE


 

Posts: 213
Score: 115
Joined: 7/15/2005
Last Login: 5/22/2013
From: , TN, USA
Status: offline 		Scott, I should have told you what I use. I use West Epoxy resin 105, and hardner 206.
They call 206 hardner a "slow hardner" but I personally like it's working time. These
quality epoxies often are mixed at ratios other than 50/50, so as mentioned a gram scale
is needed to mix it properly. For example West is mixed at a 5 to 1 ratio. They make diet scales for $10.00 to $20.00 that work fine. I glass reinforce wings, apply finishing cloth, lay up fuselages, and fuel proof engine compartments, all with the same resin. Greg


Hide Signatures

(in reply to SCOTT42)
       Post #: 14

RE: sticky epoxy - 1/19/2012 6:45 AM   
MetallicaJunkie



Posts: 5330
Score: 243
Joined: 9/17/2006
Last Login: 5/17/2013
From: Donna, TX, USA
Status: offline
quote:

ORIGINAL: blvdbuzzard

Use a heat gun on it. Make it warm, not hot. It may setup after that. Go over it a few times and see how it is doing.


Buzz.

+5

_____________________________

"Propellers are notorious for inflicting serious bodily harm while vigorously defending their space" George Aldrich

Hide Signatures

(in reply to blvdbuzzard)
       Post #: 15

RE: sticky epoxy - 1/19/2012 6:45 AM   
42etus



Posts: 671
Score: 126
Joined: 7/8/2005
Last Login: 5/20/2013
From: La Pine, OR, USA
Status: offline 		I've used the West Systems epoxy with good results and also used the marine epoxies from Tap Plastics ( http://www.tapplastics.com/ ). Just don't use the hobby shop epoxy and do follow the mixing directions exactly.

_____________________________

You don''t need a parachute to skydive.
You only need a parachute to skydive again

Hide Signatures

(in reply to GREG DOE)
       Post #: 16

RE: sticky epoxy - 1/19/2012 11:58 AM   
MinnFlyer



Posts: 28525
Score: 390
Joined: 4/22/2002
Last Login: 4/27/2012
From: Willmar, MN, USA
Status: offline
quote:

ORIGINAL: MetallicaJunkie


quote:

ORIGINAL: blvdbuzzard

Use a heat gun on it. Make it warm, not hot. It may setup after that. Go over it a few times and see how it is doing.


Buzz.

+5

+6

_____________________________

Mike B. AMA# 42400 www.gettingairborne.com
Ultra Sport Brotherhood #2 - Waco Brother #188 - Cub Brother #2

"Those are my principles. If you don’t like them, I have others." - Groucho Marx

Hide Signatures

(in reply to MetallicaJunkie)
       Post #: 17

RE: sticky epoxy - 1/19/2012 5:28 PM   
vicman



Posts: 9691
Score: 189
Joined: 12/8/2002
Last Login: 5/22/2013
From: Valdese, NC, USA
Status: offline 		I use the same resin as Greg.
West also makes a pumper system that goes on each can and meters out the correct ratio with one pump. Stupid simple and perfect ratio every time. I love the stuff.

Greg, You didn't separate the wings I gave you! I'm pretty sure a shot gun would have a hard time breaking those joints.


_____________________________

Bigger Badder Meaner Faster!
Revver Brotherhood & NMPRA #41

Hide Signatures

(in reply to MinnFlyer)
       Post #: 18

RE: sticky epoxy - 1/19/2012 7:12 PM   
Instructor



Posts: 293
Score: 105
Joined: 5/4/2002
Last Login: 5/21/2013
From: Swoyersville, PA, USA
Status: offline 		Try using CA over the epoxy. Use a latex glove or a small baggie and then spread it over the epoxy with your finger. It will set up and then you can sand it smoth.....

Larry

Hide Signatures

(in reply to vicman)
       Post #: 19

RE: sticky epoxy - 1/19/2012 7:28 PM   
joebahl


 

Posts: 955
Score: 132
Joined: 12/30/2007
Last Login: 5/22/2013
From: joliet, IL, USA
Status: offline 		I think ca would make a bigger mess just try heating it up a bit and see what it does. I use west systems also with great results ,i dont know how you could even sand epoxy after trying west systems resin .

Hide Signatures

(in reply to Instructor)
       Post #: 20

RE: sticky epoxy - 1/19/2012 10:09 PM   
Altered1


 

Posts: 234
Score: 106
Joined: 4/2/2011
Last Login: 5/21/2013
From: Melbourne, AUSTRALIA
Status: offline
quote:

ORIGINAL: speedracerntrixie


quote:

ORIGINAL: Altered1

Scott

Google is your friend! 

http://www.westsystem.com/ss/

As the Epoxy reaction is exothermic, warming your mixture will make it easier to apply, can reduce bubbles and assist with kicking off the curing.   I always add just a touch more of the catalyst to ensure a solid set.  Mix very well as others have indicated.




Adding more catalyst actually hurts you here




Just a touch to ensure I have enough.... probably 49:51 in a half and half mix....



Hide Signatures

(in reply to speedracerntrixie)
       Post #: 21

RE: sticky epoxy - 1/19/2012 11:04 PM   
BobbyMcGee


 

Posts: 202
Score: 131
Joined: 1/19/2012
Last Login: 5/6/2013
From: Palm Beach, FL, USA
Status: offline 		Maybe you mixed different cure rates? ... ie, used a 5 minute hardner and a 30 minute resin, or vise versa. I once did that. It took days to cure.

_____________________________

Freedoms just another word for nothing left to lose. Nothing, dont mean nothing if it aint free!

Hide Signatures

(in reply to SCOTT42)
       Post #: 22

RE: sticky epoxy - 1/20/2012 2:59 AM   
vicman



Posts: 9691
Score: 189
Joined: 12/8/2002
Last Login: 5/22/2013
From: Valdese, NC, USA
Status: offline 		Yeah Joe, It does sand super nice too.

I don't think I would try the CA method here. If you can get it to kick off with some heat that might be the best solution other than trying to take it off.


_____________________________

Bigger Badder Meaner Faster!
Revver Brotherhood & NMPRA #41

Hide Signatures

(in reply to joebahl)
       Post #: 23

RE: sticky epoxy - 1/20/2012 6:42 PM   
Instructor



Posts: 293
Score: 105
Joined: 5/4/2002
Last Login: 5/21/2013
From: Swoyersville, PA, USA
Status: offline 		I have used the CA method 100's of times and never had a problem with it. Have any of you that said " Don't use the CA method" ever try it? I'll save a lot time and cure the Epoxy........

Larry

Hide Signatures

(in reply to vicman)
       Post #: 24

RE: sticky epoxy - 1/20/2012 6:57 PM   
speedracerntrixie


 

Posts: 2381
Score: 189
Joined: 6/7/2010
Last Login: 5/22/2013
From: San Jose, CA, USA
Status: offline 		CA will not cure epoxy. It will skin over it so you won't feel the sticky surface but under you will still have half cured epoxy that provides close to zero strength.

Hide Signatures

(in reply to Instructor)
       Post #: 25

Page:   [1] 2   next >   >>  
All Forums >> RC Airplanes >> Questions and Answers >> sticky epoxy
Page: [1] 2   next >   >>  




Jump to:


 
Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

RC Universe is a service of Internet Brands, Inc. Copyright © 2001-2013.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America


0.781RCU1