Carpenters glue ok for ply work? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 03-20-2007, 08:03 PM   #1
Peter Gordon
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Carpenters glue ok for ply work?

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I'm putting together an engine box, complete with landing gear plate, side doublers, and a few ply bulkheads. This is for a 50cc sized plane. Anything wrong with using the yellow carpenters glue sparingly? I'm just looking at the amount of gluing and it'll cost me a fortune in 3 hr epoxy...
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Old 03-20-2007, 08:43 PM   #2
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I think carpenters glue is ok,but not my first choice. i would go with polyurethane myself.You use a lot less and it sands easily.

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Old 03-20-2007, 10:21 PM   #3
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I have used a carpenter's (cabinetmaker's more precisely) with success. Specifically the yellow Titebond brand. I am using aliphatic glues mostly now, like Glu-It and variants from Pica. They sand easier than epoxy, but are still substantial. I would still use epoxy and thckeners in critical areas. West system epoxy and their proprietary fillers are very good and economical in quantity. If you ever build a float plane you need to be conscious of whether the glues you use are water siluble after drying.
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Old 03-20-2007, 10:35 PM   #4
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Soon as you mention engine box or firewall's I go to epoxy. I have also used CA when the joint was snug or no gaps but only up to 40 size. To use that much epoxy you must be putting it on heavy as a light coat does just as good.
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Old 03-20-2007, 11:40 PM   #5
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I use titebond for mostly all my construction. When you build 1/2 scale, you need lots of glue!!.
For firewalls I also dowel through the fuse sides into the f/wall and lots of triangle stock. No problems yet. On my 1/2 scale Pup, the firewall is 1in thick, dowelled and tri-stock, hope it holds up, hanging a 342cc motor on it!!
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Old 03-21-2007, 08:48 AM   #6
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Re: Carpenters glue ok for ply work?

Originally Posted by Peter Gordon
...Anything wrong with using the yellow carpenters glue...
Nothing wrong, everything right.

I like the Lepages yellow carpenters glue.
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Si fractum non sit, noli id reficere - (If it ain't broke, don't fix it).
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Old 03-21-2007, 10:41 AM   #7
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Although I am not in your league of huge planes, I have used carpenter's glue almost exclusively for just about everything for many years. For things like firewalls, I like to hedge my bets a bit by using triangle stock at the edges, or better yet, designing the front of the fuse such that the firewall fits into slots and/or dowelled through the fuse sides and also is glued. I tend to like the yellow carpenters glue, thinned down quite a bit - it really absorbs into the wood and the overall joint is many times stronger than the wood itself.

My Senior Telemaster is constructed exclusively with Weldbond - the white stuff that is, I believe sold also as RC56 by the hobby industry at a huge markup. Again, I thin it with water. Supposedly, it is more waterproof than carpenters glue - I may find out soon, as this aircraft will be on floats at times.

I like Balsarite a lot. As my favorite covering is (the becoming very scarce) Micafilm, I have used lots of Balsarite. I always coat the inside of fuel compartment, engine compartment, etc, with the stuff. I hate epoxy, and if I have to repair or replace something, I know that the Balsarite is easy to remove, or to reattach something to. Balsarite really strengthens stringers or other potential weak spots.

Noe of these glues add much weight as they contain a lot of solvent. Epoxy is almost 100% glue, so finished weight is the same as unmixed weight.

The only glue joints I that I have ever "tested" (well, crash tested may be more accurate) and that have failed have been epoxy. It has happened on a number of occasions to many of us. Examination of the failure has usually shown the epoxy to be rubbery or just weak. And, it does not absorb very far into the wood, unless thinned with alcohol or heated. That, plus the mess and smell, turns me right off the stuff.
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