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#1 jdb1930

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Posted 22 January 2018 - 01:01 PM

I am about to start my cozy and I am wondering the best epoxy to use. I have seen EZ Poxy, MGS 335, MGS 285, but I am not sure which one I should use.



#2 TMann

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Posted 22 January 2018 - 04:00 PM

I use MGS335.

Aircraft Spruce does not charge a hazmat fee and it wets out real nice.


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#3 Kent Ashton

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Posted 22 January 2018 - 04:15 PM

There is a comparison here but the 2006 prices are a little old. 

http://www.cozybuild...Price_Table.pdf

 

And a Gary Hunter presentation here.  Pay attention to what to use on fuel tanks and what he says about post cures.

http://www.cozybuild...poxyDoDonts.pdf

 

I have not bought epoxy in a few years and have lost track of hazardous material shipping costs but I suggest you start with a postal scale and a spreadsheet for mixing, then you can easily switch epoxies any time.  What I do is punch a hole in the cans, fill the cup with as much resin as I think I'll need and add hardener to bring the total up to the spreadsheet weight, then plug the can-holes with a machine screw when done and put them back in the hot-box.  It is not quite as fast as a dedicated epoxy pump but still pretty fast and accurate.  I don't trust the in-the-can-pumps.

 

I mostly used EZPoxy and 83 resin.  I liked MGS but it started to give me an itch.

 

Have you joined the Cozybuilder's list?  There is always some discussion of epoxies.  Search the archives. 


-Kent
Cozy IV N13AM-750 hrs, Long-EZ-85 hrs and sold


#4 jdb1930

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Posted 22 January 2018 - 05:16 PM

Thank you, I think I will try the mgs335 and go from there.

 

No I haven't joined the cozybuilders list.



#5 B52

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Posted 04 April 2018 - 07:49 AM

I read :-   "  Rutan Aircraft Factory now recommends WEST SYSTEM epoxy for certain homebuilt aircraft applications, particularly where a moisture resistant epoxy is desired.... etc..

 

any comments on this appreciated. 



#6 Andrew Anunson

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Posted 04 April 2018 - 09:24 AM

I read :-   "  Rutan Aircraft Factory now recommends WEST SYSTEM epoxy for certain homebuilt aircraft applications, particularly where a moisture resistant epoxy is desired.... etc..

 

any comments on this appreciated. 

I will answer that with my best guess at the answer....

 

1.)  West System 105 Resin with 209 Hardener is an approved laminating system for the RAF Long-EZ / Cozy type builds.

2.)  105 Product Description - "105 Resin is a clear, low-viscosity liquid epoxy resin. Formulated for use with one of four WEST SYSTEM hardeners, it can be cured in a wide temperature range to form a high-strength solid with excellent moisture resistance"     209 Product Description - "209 Extra Slow Hardener is formulated for general coating and bonding applications in extremely warm and/or humid conditions or when extended working time is desired at room temperature. Provides approximately twice the working time of 206 Slow Hardener. 105/209 forms a high-strength, moisture-resistant solid with excellent bonding and barrier coating properties."

 

So, yeah, 105/209 is RAF approved, and according to the manufacturer it has excellent moisture resistance.

 

I don't have a clue what "moisture resistance" means, because all of our cured epoxies have excellent moisture resistance... and none of them have moisture resistance while being mixed / cured.

Interesting to me is that 209 is formulated for use in "warm and/or humid conditions"...  that may be a good reason to use the product.

 

Was that a good guess?


Edited by Andrew Anunson, 04 April 2018 - 09:27 AM.

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#7 B52

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Posted 04 April 2018 - 08:31 PM

Thanks Andrew.

 

Looking at ..>>http://www.cozybuild...rice_Table.pdf  It seems to be more about the pot life and the climate temperature...  Or is there a difference in rigidity ?



#8 Andrew Anunson

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Posted 05 April 2018 - 09:12 PM

Figure out a way to use approved epoxy. There is a Cozy for sale that nobody will buy because it was built with un-approved epoxy.
West is only approved with very slow (209) for layups. The faster hardeners can exotherm on some layups... so I suppose if an epoxy system can't be used for the entire build then it wasn't approved.

That being said, if you build with MGS and use all fast hardener you might get exotherm too.
Andrew Anunson
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#9 Voidhawk9

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Posted 08 April 2018 - 09:14 PM

Easy to say use an approved epoxy when you live in the same country as those approving epoxies.  :) 

Happily, I found local composites gurus who were able to advise on local options that are superior to West!


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#10 Kent Ashton

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Posted 09 April 2018 - 10:05 AM

Happily, I found local composites gurus who were able to advise on local options that are superior to West!

 

So what did they come up with?


-Kent
Cozy IV N13AM-750 hrs, Long-EZ-85 hrs and sold


#11 Voidhawk9

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Posted 09 April 2018 - 02:07 PM

Araldite K3600 (used to contruct Jabirus, apparently)

Adhesive Technologies ADR246 (used in at least 1 aircraft project and high-performance marine). This is what I am using.


Aerocanard (modified) SN:ACPB-0226 (Chapter 7)

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