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To glue 2 boards together (Read 2,206 times)
 
Dick Bernard
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To glue 2 boards together
Dec 21st, 2015 at 7:48pm
 
Do you have to apply glue on both boards or just one and then clamp them together?

Thank you
Dick
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Robert Hayward
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Re: To glue 2 boards together
Reply #1 - Dec 21st, 2015 at 8:13pm
 
I almost always put a thin layer on each board.
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John Cepko
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Re: To glue 2 boards together
Reply #2 - Dec 21st, 2015 at 8:17pm
 
Robert Hayward wrote on Dec 21st, 2015 at 8:13pm:
I almost always put a thin layer on each board.



Same here.
I also brush the glue out all nice and even, them once the boards are put together, I give them a little smush and a wiggle before clamping.
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robo_hippy
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Re: To glue 2 boards together
Reply #3 - Dec 21st, 2015 at 11:54pm
 
Well, if you are a master, you could get away with glue on only one surface. Most of the rest of us mere mortals will apply glue to both surfaces. If you don't get any 'squeeze out', you didn't put enough glue on. I spread with anything from a concrete trowel to credit cards with tiny teeth cut in them like the linoleum glue spreaders, to popsickel sticks.

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Ed Weber
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Re: To glue 2 boards together
Reply #4 - Dec 22nd, 2015 at 8:23am
 
It's always best to completely cover both glue surfaces.
Wood glue bonds with the cellulose in the wood, so you want to cover all the surfaces to be glued. The wood can also absorb (draw in) some of the glue, leaving a dry area. if you only spread glue on one piece, you have no guarantee that you will get full coverage.
Spreading a thin, even layer with a brayer (roller) or brush on both surfaces will usually result in less glue used since you don't have to try and guess how much to put on one side to let it squeeze and spread.
It also results in less glue used and less glue wasted in the form of squeeze out, less mess and easier to handle due to less slipping of the joint.

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« Last Edit: Dec 22nd, 2015 at 8:42am by Ed Weber »  
 
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Tom Coghill
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Re: To glue 2 boards together
Reply #5 - Dec 22nd, 2015 at 4:05pm
 
To be sure I get good coverage on both surfaces, I coat both... and yes, glue swqeezes out both sides.  I try to clean that up with a wet rag, otherwise I have to sand off all the runs after it cures (for flat work).  For turning, I usually don't get concerend about the squeeze-out as long as it will not effect they way I plan to grasp the wood in the chuck.
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Bill Schoppert
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Re: To glue 2 boards together
Reply #6 - Dec 28th, 2015 at 4:06pm
 
I always put glue on one side but you have to put enough on to get squeeze out. I use a piece of all thread to spread the glue. Does a very nice job of spreading.
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Re: To glue 2 boards together
Reply #7 - Dec 28th, 2015 at 5:17pm
 
Both faces.  My father was/is a cabinet maker his entire adult life.  He always put glue on both faces.  You may be able to "get away" with only one face if I am going to glue two boards together, I'd the best odd of it working.
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John Grace
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Re: To glue 2 boards together
Reply #8 - Dec 28th, 2015 at 10:21pm
 
What's right is what has worked for you in the past.  I did cabinetmaking for years before coming back to turning.  Not a professional by any means but I never put glue on both sides...so long as there's enough for 'squeeze out' then that's always been good enough.  Never had two pieces come apart to include my laminated bowls.  But as I said...what works for you is what's right.
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Charlie Zapalac
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Re: To glue 2 boards together
Reply #9 - Jan 11th, 2016 at 2:03pm
 
I dip the whole board in a vat of glue to make sure, then let it soak for 10 minutes before removing and clamping up Shocked
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Re: To glue 2 boards together
Reply #10 - Jan 13th, 2016 at 6:44pm
 
Charlie Zapalac wrote on Jan 11th, 2016 at 2:03pm:
I dip the whole board in a vat of glue to make sure, then let it soak for 10 minutes before removing and clamping up Shocked



OMG!!!! I thought I was the only one who did that!!!! Thumbs Up Thumbs Up Thumbs Up Shocked Shocked Shocked
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Tom Albrecht
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Re: To glue 2 boards together
Reply #11 - Jan 15th, 2016 at 5:32pm
 
Unless you are using a polyurethane glue like Gorilla glue or Titebond 2300-- then you only glue one piece and you dampen the other piece with water.
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Ed Weber
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Re: To glue 2 boards together
Reply #12 - Jan 15th, 2016 at 5:53pm
 
Tom Albrecht wrote on Jan 15th, 2016 at 5:32pm:
Unless you are using a polyurethane glue like Gorilla glue or Titebond 2300-- then you only glue one piece and you dampen the other piece with water.


I never heard of such a process, If someone could explain the thinking behind this I would really appreciate  it.
Why would you deliberately want to dilute the adhesive, thereby weakening it's holding capabilities?
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John Cepko
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Re: To glue 2 boards together
Reply #13 - Jan 16th, 2016 at 1:09am
 
Some adhesives, like the gorilla glue need water to set.
They usually react just to the humidity in the air.
Wetting the wood speeds things along a tad.
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Ed Weber
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Re: To glue 2 boards together
Reply #14 - Jan 16th, 2016 at 9:50am
 
Thanks, I hadn't heard that technique before.
I don't use polyurethane glue much, 99% of the time it's Titebond 1,2 or 3
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Tom Albrecht
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Re: To glue 2 boards together
Reply #15 - Jan 16th, 2016 at 3:39pm
 
The polyurethane glues are really best for exterior projects, and interior projects that need the gap filling abilities.  They expand with moisture.  It's a similar formula to the  "Great Stuff" expanding foam insulation products.
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Don Stephan
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Re: To glue 2 boards together
Reply #16 - Jan 16th, 2016 at 8:34pm
 
When polyurethane glue, and "Great Stuff" expand they become open foam that is easily crushed.  As insulation this is a desirable property, because the trapped air is a good insulator. 

Joints glued with polyurethane need to be well clamped because the glue naturally expands and becomes open foam otherwise, making a very weak joint.
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Ed Weber
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Re: To glue 2 boards together
Reply #17 - Jan 16th, 2016 at 9:09pm
 
Don Stephan wrote on Jan 16th, 2016 at 8:34pm:
When polyurethane glue, and "Great Stuff" expand they become open foam that is easily crushed.  As insulation this is a desirable property, because the trapped air is a good insulator.

Joints glued with polyurethane need to be well clamped because the glue naturally expands and becomes open foam otherwise, making a very weak joint.


One of the reasons I don't use it often.
I think a common misconception is that if the foaming fills the gap the joint can be less than perfect.
I have used poly glue for exterior  repairs (not wood). For wood projects I use Titebond 3.
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Re: To glue 2 boards together
Reply #18 - Jan 19th, 2016 at 3:07pm
 
Another trick ,glue both surfaces, I rub the glue in  with my finger to get the glue into the pores, instead of gluing boards face up ,I glue face down, the glue will tend to run down filling any voids in the joint if any, do not over tighten the  clamp pressure ,will squeeze out all the glue weakening the joint
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