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Glues in general

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  • Member since
    March 2020
  • From: South Florida
Glues in general
Posted by Having-fun on Tuesday, June 11, 2024 10:55 AM

 

Here is another comment about glues, both CA and wood. I have been reading different posts in this forum about glues, I think that I am following all the proper steps to make sure that the glue ( Whatever CA or wood ) do the job I want it to do. Allow me  to explain:

 

Most of the time the glue work as intended, but there are times that I glue something, usually 2 wood parts, let it seat for a long while, sometimes overnight, then when I go to test it, it simply do not hold, as soon as I put dome minor stress on it, the parts separate.

 

This has happened when I CA a small wire to a wood part, and also when I gluing two wood components to each other. I use both Gorilla CA glue, when gluing wire to wood, and Titebond wood glue when gluing 2 wood parts together.

 

Any ideas as what I may be doing wrong?

 

Thanks

 

Joe

 

  • Member since
    March 2003
  • From: Towson MD
Posted by gregbale on Wednesday, June 12, 2024 3:26 PM

In my experience with wood and CA, the wood bonding surface should be saturated with the adhesive and allowed to cure completely first -- which is usually fairly quick on a porous material like wood -- and only then should the bonding to another surface or dissimilar material be done.

Don't know the exact chemistry behind it, but it's seemed to work consistently over the years.

But note: if you are, say, gluing narrow frame ends to narrow frame ends (i.e., joints), you are playing right into CA's greatest weakness, which is generally poor shear strength. It won't take much angular pressure to break a bond like that unless something like a pin is used to strengthen that connection.

Greg

George Lewis:

"Every time you correct me on my grammar I love you a little fewer."
 
  • Member since
    April 2020
Posted by Eaglecash867 on Wednesday, June 12, 2024 7:04 PM

You might need to add additional, mechanical support to the joints you're trying to make by drilling holes, adding metal rods, etc.

Any pictures of what you're specifically trying to accomplish?  That might help people throw some ideas out there for you to try.

"You can have my illegal fireworks when you pry them from my cold, dead fingers...which are...over there somewhere."

  • Member since
    August 2005
  • From: Mansfield, TX
Posted by EdGrune on Thursday, June 13, 2024 12:17 PM

What wood glue are you using?   Many of the woodworking Youtubes and DYI shows tout the use of carpenter's yellow wood glue.   Properly applied and allowed to dry (overnight or longer) in clamps results in a bond that is often stronger than the wood itself -- with the wood breaking before the joint.   

Cautions are presented about gluing end-grain.    Mechanical fasteners to augment the joint are often used (nails, screws, dowels, finger joints, etc,)   The presenter notes that these are often used to maintain stability until the glue dries,

There are some applications I've seen where they use gel CA with a spray accelerator in addition to the carpenter's glue.   The CA stabilizes the joint until the wood glue dries.

CA glue by itself is good in tension -- where the joint pulls directly apart.   CA is poor in shear strength -- joints where the parts slide.

Gorilla wood glue is great, works well on end-grains.   But because the glue foams as it cures it pushes unsecured joints apart while curing.   Clamping the parts is a necessity

 

 

  • Member since
    March 2022
  • From: Twin cities, MN
Posted by missileman2000 on Saturday, June 15, 2024 6:53 AM

EdGrune

What wood glue are you using?   Many of the woodworking Youtubes and DYI shows tout the use of carpenter's yellow wood glue.   Properly applied and allowed to dry (overnight or longer) in clamps results in a bond that is often stronger than the wood itself -- with the wood breaking before the joint.   

Cautions are presented about gluing end-grain.    Mechanical fasteners to augment the joint are often used (nails, screws, dowels, finger joints, etc,)   The presenter notes that these are often used to maintain stability until the glue dries,

There are some applications I've seen where they use gel CA with a spray accelerator in addition to the carpenter's glue.   The CA stabilizes the joint until the wood glue dries.

CA glue by itself is good in tension -- where the joint pulls directly apart.   CA is poor in shear strength -- joints where the parts slide.

Gorilla wood glue is great, works well on end-grains.   But because the glue foams as it cures it pushes unsecured joints apart while curing.   Clamping the parts is a necessity

 

 

 

I find it is really necessary when using CA on wood to use a good gel version.  I like Locktite's gel CA.  I also use the yellow carpenters glue for wood.

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