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A question of Glue.

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Forum topic by Robbo posted 06-11-2011 04:43 AM 884 views 0 times favorited 5 replies Add to Favorites Watch
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Robbo

3 posts in 2012 days


06-11-2011 04:43 AM

Hi Guys
Being new to woodwork I wonder if I can ask what may be a silly question.

I’ve got a load of glue ups to do they are about 2 mtes by 38mm I’m using PVA glue
The question is which is best, a thick single bead of glue down the middle allowing screwing them together to squeeze the glue out, or is it better brushing the glue out evenly although it tends to end up thinner?
Is there any difference in the strength of the joint?
Sorry if this is too simple a question for you guys.
Thanking you in advance.
Be Well
Robbo

-- Robbo


5 replies so far

View Bernie's profile

Bernie

416 posts in 2304 days


#1 posted 06-11-2011 05:01 AM

Not a simple question. The answer isn’t simple either, but here goes. I’m sure someone else will disagree with me and that’s OK. It’s one of the things I like about this site… I’m still learning.

I think it’s best to spread the glue out, but don’t spread it to thin. If you can, apply glue to both pieces. You always want to make sure to add enough glue so it squeeze out when clamping. If you don’t have any glue coming out , you don’t have enough. Your joint is starving for glue and thus it is weaker.

Now, if you read the label on the bottle of glue, you might read that you need to clean up the excess glue with a damp rag. Don’t do it. Water will weaken the glue and worse yet, it thins out the glue so it will seep deep into the wood and you will never get it out. When you stain your work, it will show unless you plan on painting which will cover the spot.

What I do, is I wait for about 30 minutes to let the glue gum up a bit. Then I scrape off most of it. Once it’s 100% dry (24 hrs), I sand out the thin film. Mineral spirit or a damp rag will show you the spots. Some folks like to put down blue tape on the exposed surfaces near the joints to catch the glue. That may work best for you.

One last comment, don’t ever be afraid to ask. Folks on this site are friendly and willing to help!

-- Bernie: It never gets hot or cold in New Hampshire, just seasonal!

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fussy

980 posts in 2517 days


#2 posted 06-11-2011 05:39 AM

Robbo,

The only stupid question is the one you didn’t ask. aS TO YOUR QUESTION, THAT’S STUPId! sORRY, i COULDN’T RESIST. Actually, you’ll stir up some discussion on this. Bernie has it mostly right; it is best to spread it out. As to squeeze out, you don’t want so much that it’s a mess. Thicker glue application doesn’t mean stronger joints. SOME WOODS DRINK GLUE UP AND SHOULD BE GLUED ON BOTH PIECES and some don’t. (caps were accidental) You don’t want to clamp so tightly that you squeze all the glue out. That will starve the joint too. Modern pva’s are forgivinjg. You will develop a feel for it and for now just make sure it’s covered.

By the way, several years ago I was driving into Nottingham from the west, and I remember a sign that said “Sherwood Forest used to be here”. Evidently Robin stole it for firewood. Lovely part of a lovely country.
Steve

-- Steve in KY. 44 years so far with my lovely bride. Think I'll keep her.

View childress's profile

childress

841 posts in 3009 days


#3 posted 06-11-2011 07:33 AM

The main thing that hasn’t been said yet, is that you need to wet the surfaces being glued (with glue of course, not water) Sometimes you can achieve this by applying a good amount of glue to one surface, but if able, it’s best to wet both surfaces before clamping (and yes, clamping can be achieved by using screws). So apply and spread over the whole joint being laminated…. Have fun :)

-- Childress Woodworks

View Robbo's profile

Robbo

3 posts in 2012 days


#4 posted 06-11-2011 09:36 AM

Thank Folks
Guess The one’s I’ve done will be relying on the screws, oops
As I’ve got many to do, I think I’ll try a small foam roller
Robbo

-- Robbo

View brtech's profile

brtech

906 posts in 2389 days


#5 posted 06-12-2011 12:27 AM

Just saw a video that explains the 1 side vs 2 side pretty well.

If you have a very short setup, 1 side is okay.

If it’s going to take a while, the glue will skim over, and when you push the pieces together, the unglued side won’t get wet glue, which prevents it from soaking in.

You want some squeeze out. If you don’t get any, you may not have enough glue on the surfaces. You judge how well you did by the squeeze-out. A lot is too much, none is too little. A little squeeze out is just right.

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