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First time Epoxy

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Mike Whisky

Joined: 05 Jun 2006
Posts: 336
Location: Switzerland

Posted: Fri Sep 07, 2007 9:20 am Post subject: First time Epoxy

Today I used for the first time epoxy, after I read through Tims website I bought West System and the pump kit. I used the 206 Hardener (slow) plus the thickener 406 Colloidal Silica and glued the gas strut attach doubler in the inner door shell. 



After at least 1 hour the epoxe still wasn't hard, it definately got harder but I was under the assumption that it will be hard as a brick after half an hour.



Is that normal?



Michael



www.wellenzohn.net

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_________________
RV-10 builder (flying)
#511

Deems Davis

Joined: 09 Jan 2006
Posts: 925

Posted: Fri Sep 07, 2007 10:13 am Post subject: First time Epoxy

Michael,  depending upon the temperature/humidity of the environment its 

curing in, it may be entirely normal. Heat has a dramatic effect on the 

cure time for epoxy. I'm sure some chemist could elaborate, but while 

most epoxies will harden to the point where they can be worked with 

shaping tools (files and sandpaper) within hours (say 2-8 hours (at) room 

temperature) they don't' develop their full strength usually for 24 

hours. I have used Halogen shop lights directed directly at some parts 

to generate local heat to speed the curing times. (Be careful of 

generating too much heat and a fire potential).



The 'Pot' life of epoxy is different than the cure time. Pot life 

usually refers to the time that you can effectively work with it in a 

cup until it begins to thicken to the point that it begins to get lumpy 

or is difficult to wet-out the glass cloth. Additionally, you will find 

that mixing large amounts of epoxy in a single container/cup will result 

in the mixture generating it's own heat as the catalytic reaction begins 

to take place, when this happens a cup/pot of epoxy can VERY quickly 

harden, to the point of burning your hand if holding it. With the west 

system pumps it's easy to mix a couple pumps worth in a cup at a time 

and then mix more if you need it.



 Deems Davis # 406

'Its all done....Its just not put together'

http://deemsrv10.com/



Michael Wellenzohn wrote:

 	  Quote: 	
		   



 Today I used for the first time epoxy, after I read through Tims website I bought West System and the pump kit. I used the 206 Hardener (slow) plus the thickener 406 Colloidal Silica and glued the gas strut attach doubler in the inner door shell. 



 After at least 1 hour the epoxe still wasn't hard, it definately got harder but I was under the assumption that it will be hard as a brick after half an hour.



 Is that normal?



 Michael



 www.wellenzohn.net



 --------

 RV-10 builder (wings)

 #511





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 http://forums.matronics.com/viewtopic.php?p=133258#133258

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rene(at)felker.com
Guest

Posted: Fri Sep 07, 2007 10:25 am Post subject: First time Epoxy

It depends on the temperature of the air.  But I normally plan on waiting 24

hours unless the temperature is > 85F.



Needs to be at least 70F.



Rene' Felker

N423CF

40322

801-721-6080

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Mike Whisky

Joined: 05 Jun 2006
Posts: 336
Location: Switzerland

Posted: Sat Sep 08, 2007 1:08 am Post subject: Glueing door shells

Thank you guys for your answers. According to what you wrote I should be fine.

Sorry to ask one one question for the door shell gluing. Do you apply the epoxy with a brush on the parabeam glass until its wet and then put it on the door shell?



Michael



www.wellenzohn.net

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RV-10 builder (flying)
#511

poneill(at)irealms.com
Guest

Posted: Sat Sep 08, 2007 1:31 am Post subject: First time Epoxy

I haven't gotten to the glass parts of the construction yet, but I was

wondering if most people are using the slow hardener?  I haven't worked with

fiberglass for a while, but I did do a lot of glass work on boats years ago.

I remember the West slow hardener as taking forever to kick and always used

the fast.  Do some of the tasks require that long of a pot life or cure

time?



Best Regards,

Patrick #40715



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LarryRosen

Joined: 16 Jan 2006
Posts: 415
Location: Medford, NJ

Posted: Sat Sep 08, 2007 3:36 am Post subject: First time Epoxy

Use the slow hardener when joining the door shells.  You will want the 

extra time. 



I used one of those small metal handled brushes that plumbers use to wet 

out the parabeam glass, but any brush would work.



Larry



Patrick ONeill wrote:

[quote] 



 I haven't gotten to the glass parts of the construction yet, but I was

 wondering if most people are using the slow hardener?  I haven't worked with

 fiberglass for a while, but I did do a lot of glass work on boats years ago.

 I remember the West slow hardener as taking forever to kick and always used

 the fast.  Do some of the tasks require that long of a pot life or cure

 time?



 Best Regards,

 Patrick #40715



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_________________
Larry Rosen
#40356
N205EN (reserved)
<http>

rene(at)felker.com
Guest

Posted: Sat Sep 08, 2007 6:00 am Post subject: First time Epoxy

I used the slow for the joining the doors and have used fast everywhere

else.  When it is real hot out side, >90F, I just make smaller batches and

work faster.  



Rene'

801-721-6080

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