Carpenters Glue Vs. Epoxy - Page 3 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-16-2010, 07:24 AM   #21
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I am: Andrew Coholic
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Re: Carpenters Glue Vs. Epoxy

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Originally Posted by TLyttle View Post
Epoxy can be thinned with alcohol. The thin epoxy penetrates farther, and is lighter. We used it to laminate skins onto foam wings. Full-strength epoxy is heavy, and it is best used in very limited quantities.

"Carpenters Glue" comes in various forms: the white glue is affected by water and other contaminants, but is fairly strong. The Aliphatic (yellow) glue is stronger yet, can be thinned with water, yet water only affects it under full, long-term immersion. The so-called "Gorilla" glues are very strong, but I find them difficult to use, due to the fact that it expands out of the joint and makes an awful mess IMHO.

I've built boats, furniture, even a car using aliphatic, and over the years I have NEVER had a glue joint fail for any reason. I have gone over many of my crashes (!), hoping to find a failed glue joint, but alas, I always find out it was my flying that was the culprit... Lots of busted balsa, no glue joint failures.
Epoxies are not equal...and a resin like I suggested can be used as is, as it is already water thin.

"white glue" - well, I have already stated not all white wood glues are equal either, and today you can purchase ones which are water proof (not resistant, proof)

Polyurethane glues like "Gorrilla" are good for many applications, however are quite different and need to be used differently. I find many people overuse glue in general (which is why some complain about the weight of epoxy, or the mess and damage water based glues can do if overused) Polyurethane adhesives need to be used sparingly, and it takes practice to know how much glue to use, on what materials and what kind of joint.

Andrew Coholic -MAAC #26287L

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