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Post by rivergreenmachine on Oct 26, 2011 22:42:23 GMT 1
I read that CA glue repairs foams, so I bought a small bottle of thin.
I have a small chunk out of my wing that I tried to glue back. Coated both pieces and held together for 2 minutes or so. NO BOND!
Is there a particular brand of CA glue that must be used? Any help with this would be appreciated. Thx!
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Post by Dillzio on Oct 27, 2011 4:13:55 GMT 1
That's very strange that you found CA glue did not bond to your foam. Usually any type at all will bond very well, and the thin stuff usually sets quite quickly.
The only possible reason I can think of is that there was so much glue that after 2 minutes it was still wet and hadn't dried yet. Perhaps try just putting the glue on one surface, and add just enough glue that the surface you put it on looks wet (doesn't quite adsorb it all)
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Post by flydiver on Oct 27, 2011 5:08:15 GMT 1
Unlike Dill I don't find that unusual at all. I think the only thing that CA bonds to well is fingers. I'm part of maybe a vocal minority that think the stuff sucks. I use it, but only when I have to. Maybe there is a difference between brands. The foam safe stuff is awful.
Try the white Gorilla glue or Sumo glue. They foam and expand so practice a bit with it. It pretty much sticks to anything and is foam safe.
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Post by rivergreenmachine on Oct 27, 2011 11:36:00 GMT 1
Hmmmm ... got the CA glue from Hobby Lobby in the model dept. Thx for the suggestions Dillzio. Maybe I'll experiment further on another piece of foam.
I'll try the Gorilla glue. Do you think there be a problem with using the Gorilla glue now that I've applied CA glue to both surfaces???
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Post by Dillzio on Oct 27, 2011 14:33:22 GMT 1
hmmm, could be. gorilla clue can really penetrate and soak into the foam as it foams up and expands, but now that the foam is covered in CA glue the gorilla glue won't be able to soak into it anymore. It should still work, perhaps just not as well. I bought a bottle of this stuff from hobbyking a few months ago: www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8456 It's great for working with CA, particularly the medium and thick stuff that takes much longer to set. Lots of different ways to use it - spray it on a thick gunk of CA glue and make is set solid, spray or wipe it on one of the surfaces to make the glue set more quickly, or even put glue on both surfaces, spray the accelerator on them then quickly put them together. The way I've been going with mine, I recon 1 2oz bottle will last me about 2 years |
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Post by rivergreenmachine on Dec 2, 2011 0:16:04 GMT 1
What is the preferred adhesive for attaching a new firewall? Plastic to foam is an interesting bond ....
I'm hesitant to use white Gorilla Glue because it may destroy the foam if I ever need to remove the firewall.
Thx for any guidance!
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Post by flydiver on Dec 2, 2011 1:50:49 GMT 1
Silicone caulk, like you use in the bathtub. Strong, but still rubbery and removable should you need to.
Don't use Goop or those kind of glues. Very tenacious and difficult if not impossible to deal with later.
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Post by Dillzio on Dec 2, 2011 9:59:43 GMT 1
It doesn't have to be silicon either, the white latex adhesive for gap filling works well too. You can also use it to fill in some of the gaps between the firewall and the foam for extra support... oh, and make sure the firewall is only clamped down GENTLY.
I clamped mine down with an F-clamp once and it ended up deforming the foam and ruining the thrust angle.
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Post by rivergreenmachine on Dec 2, 2011 12:59:37 GMT 1
I appreciate the guidance and tips from you Experts! My son & I are having a blast with our SuperCub .... fun to fly and it gives us a Father-Son project to fix every time we come home!
Thanks a bunch!
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Post by flydiver on Dec 2, 2011 17:29:41 GMT 1
Remember, the stuff will need a day to cure!
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Post by renard80 on Dec 3, 2011 0:56:44 GMT 1
You can also use it to fill in some of the gaps between the firewall and the foam for extra support. That brittle plastic firewall is a pain in the wotsit. I am running brushless, fairly heavy with its mount, and when she hits the dirt with a thump it often breaks the firewall. So I am forever trying ways to beef up the firewall. I have been pushing hot-melt glue into those gaps between the firewall and the foam, but have often wondered if I am doing any harm - that is, why are the voids there in the first place? Do they have a purpose, other than to make it easier to crack the firewall  ? |
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