Has anyone ever tried substituting polyurethane glue (e.g. Gorilla Glue) for epoxy in assembly? If so how successful was it?
It's ability to foam and fill gaps seems useful, and I was considering using it to form fillets. The only thing is the foam seems very hard to sand. I also thought it would be good for reinforcing motor mounts.
It seems to be very light when cured.
So far the only other downside is the fact that it has a decided 18-24 hour cure time.
Any thoughts?
For internal construction, it should be at least comparable to Titebond II and similar adhesives. For external assembly, such as fillets, the foam will be problematic if it's not cleaned off.
-Kevin
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It's not very good as fillets - it foams too much during the curing process, and it's very difficult to sand. That said, it's great for bonding parts together... I've experienced crashes where the airframe or the plywood fin failed before the joint.
What kind of motor-mount reinforcing do you want...? It won't "wick" into the paper like CA, but you *might* be able to do a fiberglass layup with it. I believe that Rick mentioned trying this, but I never heard the results. Personally, I find epoxy resins easier to work with for fiberglassing.
If you want to slap a rocket together overnight and fly it, I'd stick with CA. If you want something strong and long-lasting, long cure times lead to high-strength joints.
I use Gorilla Glue often for construction...
Minor draw backs / considerations before use.
1- It foams / EXPANDS as it cures... this mean what ever you are bonding needs to be clamped VERY WELL or it will move. 2- DO NOT get it on your skin.. it stains and the stains can last for weeks or more......As for strength.. bonds as well as epoxy in my opinion.
Bobby B NAR 79350 L2
A glue thread. . . . I'm outta here!
:-D .....you crack me up sometimes!!
Shelf life of an opened bottle seems to be pretty poor. I guess atmospheric moisture leaks in and causes it to cure, at least on the surface (which makes it pretty hard to get to the rest of it, of course.)
:-( BillW
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