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Oct 21, 2010, 10:02 AM
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Discussion

Epoxy Vs Gorilla glue?


Can I substitute Gorilla glue for epoxy? Are the holding strengths the same or is epoxy still the best? I know the GG swells a bit but other than that....
-Dave
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Oct 21, 2010, 10:29 AM
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RobC(UK)'s Avatar
If you have a good tight joint GG is probably as strong as epoxy. If you have a loose joint epoxy will fill the gaps whereas GG will foam and expand to fill the joint and have the strength of a prawn cracker!
Oct 21, 2010, 10:36 AM
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Question, would drilling some small holes in each half of the wing root wood add to the stability when the epoxy/ GG seeps in? Technically it would then grab the whole thickness of the mating wood.
Oct 21, 2010, 10:45 AM
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RobC(UK)'s Avatar
The root ribs are only for keeping the wings aligned and at the same incidence. It is the plywood wing joiner that carries most of the load. You need to make sure that it is firstly up to the job and secondly that it is well bonded to the wing spars.
Oct 21, 2010, 10:53 AM
Registered User
GG works on all types of foam and porous surfaces, eg. balsa. It will adhere to plastics as well, particularly if you rough up the surface a bit.

I would not expect GG to work on metallic surfaces, however.
Oct 21, 2010, 11:00 AM
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Tepid Pilot's Avatar
If yer talkin' joining wing halves, use epoxy. Period. 30-minute preferred. Some folks say to make a bunch a holes in the wood with a pin prior to gluing in order to strengthen the joint, that's up to you. My feeling is, if you're gonna abuse the thang enough for the joint to fail it's gonna fail with or without the pin holes.

TP
Oct 21, 2010, 11:01 AM
Registered User
Quote:
Originally Posted by rafe_b
I would not expect GG to work on metallic surfaces, however.
The white glue works on metals too.
Oct 21, 2010, 11:03 AM
ground penetration specialist
Nathan Schmoekel's Avatar
Gorilla is lighter than epoxy, and can be either strong or remain a bit flexable... The trick is controling the density. If you can compress and contain gorilla glue you can get an incredably dense hard gap filling effect. If you use gorilla glue on the outsides of joints, like inside a fusalage, it can help hold things together when the CA gets brittle and old.

In a DLG of mine I had the tail-boom area of the fusalage start to crack...I decided to fill the cavity to spread the loads over a larger area. The fuse space was about 3 x 2 x 2" with a 3/8" tail boom running through the middle.

I mixed gorilla glue and water in a cup. Mixed for a good 2-3 minutes till the glue started foaming, then I packed the slurry into the fuse and clamped a piece of cell-foam over it. After the glue had dried the foam was cut away I was left with a solid block of crazy strong, solid foam fill. That plane has hunderds more launches on it now and that area is much stiffer that when new. The repair added only 4 grams. If I had filled that bay with epoxy and microballoons the repair would weigh 10 times as much.


Now that being said, if you are laminating two pieces of wood together and the fit is pretty good, I think epoxy is the way to go....much less fuss than the clamping, waiting, and oozing with gorilla glue.
Oct 21, 2010, 11:49 AM
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Quote:
Originally Posted by Tepid Pilot
If yer talkin' joining wing halves, use epoxy. Period. 30-minute preferred. Some folks say to make a bunch a holes in the wood with a pin prior to gluing in order to strengthen the joint, that's up to you. My feeling is, if you're gonna abuse the thang enough for the joint to fail it's gonna fail with or without the pin holes.

TP
It's been my experience, and I have heard this from others as well, that epoxy doesn't adhere well to Elapor. On the other hand, I've yet to encounter any variety of foam on which Gorilla Glue won't work.
Oct 21, 2010, 11:51 AM
Real Time Recon
realtimerecon's Avatar
I find nothing better than 30 min. epoxy.
Oct 21, 2010, 11:58 AM
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Thread OP
Im thinking of either laminating a sheet of glass or carbonfiber tape between the halves of wooden spar. or should I put a piece of aluminum or metal between there? If I used metal, would epoxy hold the metal to the ply spar? I wanna strengthen that spar as well as possible as that piece of junk sheared right in half.
-Dave
Oct 21, 2010, 12:33 PM
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flypaper 2's Avatar
Glue the two halves together without a joiner, then put a 3 in. wide strip of 6 oz glass cloth across the outside surface with epoxy finishing resin and I'll wager it won't break at the centre no matter how hard you try.

Gord.
Last edited by flypaper 2; Oct 21, 2010 at 04:26 PM.
Oct 21, 2010, 03:52 PM
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Tepid Pilot's Avatar
Quote:
Originally Posted by rafe_b
It's been my experience, and I have heard this from others as well, that epoxy doesn't adhere well to Elapor. On the other hand, I've yet to encounter any variety of foam on which Gorilla Glue won't work.
Gorilla glue has its uses, but the only foam I find to be tolerable exists at the top of a frosty cool mug of Sam Adams or A&W.

TP
Oct 21, 2010, 04:06 PM
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Dennis Everett's Avatar
Dave , post a pic of the type of joint your talking about , much easier to see what needs to be done that way .. Dennis
Oct 21, 2010, 09:57 PM
Go Navy!
maverick06's Avatar
glue test results: https://www.rcgroups.com/forums/showthread.php?t=278613


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