Gorilla glue sucks (at filling gaps)

Gorilla glue sucks (at filling gaps)

A lot of people tell me
if your joints aren’t very tight you can just use Gorilla Glue because
Gorilla Glue expands to fill the gaps. Well, I’m not so sure
that’s such a good idea. So, let’s try this out. I’m gonna
glue these 2 pieces of wood. And I’m just gonna wipe this with
a moist piece of paper towel to make sure I’m gonna have
some moisture in the joint. So, certainly enough that this
will fill the gap all right. And, I’m going to put these plastic shims on the
corners of the joint. And that will make sure there’s gonna be
a slight gap when I clamp this together. And now the other
piece of wood on top. So I’ve got enough glue
in there to completely fill the joint even
if it doesn’t expand. But, I’m assuming
that is for the better. So, I gave this glued joint
a whole week to set. And, as you can see
it’s expanded by quite a lot. The question is really
how strong is this joint? So, let’s give it
a scientific test. (Grunting Sounds) Actually, I was just kidding.
Let’s really try this. (Snap) Not very strong at all. So what makes this glue so weak? I think the problem is
that it expands. And it expands into a foam.
And foam is just not a very good glue. So, for instance, here is
a dab of glue that I put on this piece of wood. I can just break this stuff.
Look at that, it’s just bubbles. So, why do I want to
flog a dead horse? I already know Gorilla Glue
sucks with gaps. The problem is, before I did my breaking
test by hand I prepared a bunch of samples. So I might as well test those in
my apparatus to get a reading. Each joint is 4 by 4 centimeters And I’m extending that out here because
I didn’t want to waste that much wood to 20 centimeters. And I’m applying
the force with a bottle jack which is on a bathroom scale. And I’ve got a camera to record the weight
just in case I miss the maximum reading. And I’ve already adjusted
to zero on here so that it’s zero
with the jack already on it. All right.
Here goes sample number 1. This is a gapped
Gorilla Glue joint. So, pumping very carefully. 5
10 12 15 15 It doesn’t go over 15. Yeah, I can see it yielding. Or hear it yielding. Yeah. So, about 15 pounds
for the Gorilla Glue. All right.
This is sample number 2. It’s Gorilla Glue without a gap. And I have to put my hand
on there while I’m pumping it because some of these joints
are so fragile. Just the part falling
would wreck it. I think this one might do better
because there’s no gap in it. 15
20 25
30 205 210, no not quite. 215, wow. 220 220 I can hear it crackling now. It’s about to go. 230 Not holding. Yeah, I can’t count that 235. (Crashing sound) Holy shit. Joint number 3 Yellow Elmer’s Glue, with a gap. 210 210 (Crashing sound) So close. This sample number 4.
Yellow Glue with no gap in it. 190 195 Uh oh. Is it gonna pop?
I think so. (Crashing sound) Yup. Sample number 5. Gorilla Glue with no gap. So, this
one could do fairly decently. 200 205 205 And let’s wait
for that one to pop. (Pop) Bang. It’s sample number 6. Is yellow glue
with no gap in it. 180 185 It’s coming. (Crashing sound) Whoa ho. This pin up here is very important,
just to make sure I apply the force at the right place. Sample number 7.
Yellow glue with a gap. 205 It’s a coming. (Crashing sound) I have to be careful when
I clamp these pieces on here. And now pushing this part
of the glue joint. Because that might bias it
one way or the other. All right.
This one’s gonna be an easy one because it’s a gapped
Gorilla Glue joint. So, I have to crank it
very carefully. 10 15 Here we go. Well, 15 pounds again. At least it’s consistent. Joint number 9.
Gorilla Glue without a gap. (Pop) So, this last one is another
Gorilla Glue joint that’s gapped and I know it will do
pretty poorly, so I’ll rely on my own brawn
and brute strength. Hi-yaa. I think that reads about
15.35 pounds. Yeah.
(Laughs) Now, there’s no question that the gapped
Gorilla joints performed terribly. But, when I tabulate the numbers
I actually found that the ungapped Gorilla Glue joints were a bit
stronger than the ones with yellow glue. So, Gorilla Glue can make for
a fairly strong joint. You just have to make sure
your joints are really precise.

100 thoughts on “Gorilla glue sucks (at filling gaps)

  1. I like how you open the video explicitly saying "A lot of people tell me…" so as to clarify this is not a demonstration of the glue's intended purpose or taking the company to task over its own claims.

    Just harmlessly debunking a popular myth among the ill-informed.

    That just because it expands while curing, people can't allow sloppy joints in their work believing the glue will fill any voids and still hold tightly.

    Still, somehow I knew the point of the video would be lost on some people and this comments section didn't disappoint.

    Thank you for sharing. Nice video.

  2. Why are you using this as a filller. Since it is a foam type glue, it needs to have full contact with both surfaces to expand into the wood. If there is some space when the glue begins to foam up, it becomes very weak. It needs to be to where the foam expands under pressure so it goes outwards to make a very strong film connecting the two pieces of wood, and when using this glue make sure that there is excess glue coming out between the woos to make sure there is max coverage and bondage.

  3. Seen an ole guy fix smithing hammers or jacks as some say, axes, saw handles, well all of them in his shop had wood and anyway that old man soaked them in water, BING !

    Did you hear what I said ?

    then the next day he did the pinning or bolting or whatever with that gorilla glue, he fixed all my old gardening stuff rakes mini shovels wheelbarrow just everything you name it. I think it was linseed or peanut oil lastly, I think the tools are even better now then when I bought them.

    I wish old timers could post to the internet, must be tons of knowledge out there that will go to waste.

  4. You do know that gorilla makes a wood glue that is specifically for WOOD and that stuff is amazing you should look it up sometime

  5. why most people focused on how they can comment instead of understanding first the real purpose of this video..I bet most of these people dont know how to build a simple wooden box!

  6. have you re-done the test after applying clamps to the glued area? Would sanding and cleaning help with the bonding? Lastly have you done anymore test with like construction adhesives?

  7. As mentioned here in the comments, this is a bogus test. You must wet the wood before you use the glue to get it activated correctly. It is crazy strong when applied correctly. This guy really goofed to put so much effort into this test without knowing how to use the glue correctly.

  8. What about resistance to creep? My understanding is that regular wood glue does creep but polyurethane (Gorilla, etc.) does not. I use a lot of both for my woodworking business. I mainly use polyurethane glue (on properly-tight joints) when I need the joint to A. Not creep and/or B. Dry/cure quickly.

  9. Why would you even think this glue would even possibly fill gaps? Why not use gap filling glue. And if you needed strength why would you do this? Different horses for different courses.

  10. "But the rumor(strong foam gaps) is still very widespread and often repeated" I hear this all the time, even from my friends what have gotten this info through folklore. He is only trying to clarify this misnomer to the the people who are misinformed. You guys (GG) have a commercial that shows putting GG on stone blocks, inferring that non prefect seams will work with that type of project. That application produced gap filled foam joints, (Stone Blocks are not perfectly smooth!!!) and WILL NOT BE STRONG, and that what keeps perpetuating the confusion. You can't have it both ways…Talk to your ad agency and use better examples. What do you think people will think!

  11. If you FOLLOW DIRECTIONS on the container, the results of your experiment may have been different. (Seems you did not do any of the essential designated steps.)
    1. "Surfaces should be clean and TIGHT FITTING." (In your example you left four sides open in a big gap, which prevented a pressure zone to contain the glue as it expands).
    2. "Lightly dampen one surface with WATER" Water must be used to activate the chemical agent in the glue, which causes the expansion. (I did not see any water used in your video).
    3. "Spread a THIN layer of glue on other surface." (You applied a glob.)
    I am not associated with the Gorilla Glue Co, just a member of the Common Sense Club.

  12. If you want to glue wood together, buy WOOD GLUE. All purpose glue is not the best for wood. Gorilla wood glue does not foam and it does not expand. Other than wasting wood, you wasted a lot of time with your "scientific" research.

  13. Hello Matthias.
    Can I suggest you get out of the house more? Get a girlfriend, Go see a show or something. Just get out more.

  14. Titebond 1 and 2 are so amazing even for joining wood pieces with gaps, it turns into hard rock once dried, only problem it would take more than one day to fully cure, and of course, you may need to use some tape, so the glue don't run.

  15. Thanks, Matthias. I have wondered about that (expensive) glue; from this, it is clear that I needn't ever buy it, since it is basically no better than yellow glue, and often inferior.

  16. Did you activate the glue with water? Didn't see you use it on your first test so can only assume you didn't use it at all.

  17. try adding 5 drops of vinegar to 1 TBS of glue. if you want even harder faster add vinegar and then baking soda till its like toothpaste consistency try these please

  18. Thank you Matthias. Think about how many things we purchase in life blindly. My instincts worked out pretty good. I use yellow glue for bonding wide pieces because its cost effective and it works just fine for what I'm doing. I use gorilla glue mostly for putting dowels into door hinge holes. How much it expands tells me when its time to return the screws.

  19. I never use original gorilla glue (urethane) on gapped or rough surfaces because it is too weak.  These tests verify that.  The yellow glue on a gapped joint 200 lb and gorilla on a gapped joint 15 lb.  A rough surface is just a gapped joint with a lot of small irregular gaps.  Yes, gorilla wood glue does work much better on rough wood, but if you look up the MSDS for it an yellow glue, you will see they are the same (polyvinylacetate) but you are paying more for the name brand on one.

  20. Thanks, Matthias, that's the kind of 'research' I sometimes feel compelled to do on all these 'gap filling', glue type products (of which there are many) and even cement products and additives such as sbr before I use 'em. Gorilla Glues response is predictable-I always figured it was claimed to be gap filling, which it is, if you don't need strength.

  21. you didn't add nearly enough water for that much glue. Realistically you didn't add enough water for the amount of glue it would've taken to make a .1mm layer across the entire surface you glued. If I needed to use that much glue for something I'd add drops of water to it, probably like 10 or more for that much glue.

  22. 3:53 lol. Thanks for doing these tests Matthias. This is actually something I think about every time I need to select an adhesive for a project. Now I can make more informed decisions.

  23. Matthias, have you ever considered doing this test, with some baking powder mixed into the glue? (Or is it baking soda?)

  24. Iv seen that glue used with holes drilled in the two mating surfaces, only shallow, not all the way through, would have been interesting to have a gapped + drilled test

  25. Shame you didn't include PVA glue.
    Bet a lot of people would have been surprised how well it performs when used properly…
    Fun test, thanks 🙂

  26. Very interesting, although as the manufacturer points out, making a deliberate gap (regardless of whether wood glue or Gorilla Glue is used) makes for a false result. If I know I am going to have a gap and still want strength, I would probably try epoxy.

    But my main concern with these tests is that they are testing shear strength only, and wood joints made with any kind of interlocking fit, such as rabbet, etc; are taxing the glue in the areas of shear and tensile stresses. I would expect any glue to be fairly weak when just flat bonded and then stressed only in shear.

  27. I was going to watch the video but since I already knew Gorilla glue sucks, I pass. But thank you for sharing.😁

  28. Foam is only strong in to pressive strength. You need to sandwich gaps in order to make them strong. Foam needs to be surrounded to be strong. It's not a gap filler.

  29. Gorilla Glue is actually a phenomenal gap filler if you mix it with a little water before you apply it. This is like saying Great Stuff makes for a terrible wood glue. I mean, *duh*! Like the Gorilla rep said, they never claimed their foam was structural by itself. If you want a structural gap filler, use epoxy. You put a lot of effort into proving something that should really be considered common sense.

  30. I just used GG to make two wood profiles exactly fit a aluminum U-profile – shimming them with two layers of 200g cardboard every 10cm – the result is spot on and not a structural part – just a jig guide that now has zero play and slides like a "pro".
    GG is basically PUR foam that expands when contacting water (the cans have CO2 already added, the glue "makes" it's own). Just like when mixing 2k PUR resin and adding water (never do that, if your container isn't at least 6x the volume of the resin, or you are gonna have a very crusty table…). So yeah, the foam part is not that strong – but when it expands into the pores of the wood, it holds very well.

  31. Hi this is David with old schooled garage don’t know too much about the gap situation but I have a video on YouTube of me lifting a v8 engine with this stuff I love this stuff anyways great vid and time for me to start testing the gap situation lol

  32. So many people completely missed the premise if this video. He didn't assume Gorilla classic would work on a gap, he never said that Gorilla says it will work on gapped joints. He was disproving the common myth that normal gorilla glue since it foams can be used to bond a bad spot of joinery. People really need to pay attention when people smarter than them make informative videos….

  33. I appreciate the hard work you put in for us.. Thanks.. ——– My Gorilla Glue fillers only need to be as strong as Styrofoam for me.

  34. 6/5/2019 USA Grandpa Bill: Okay, this 5-1/2 years later but I have 2-cents worth to put in. I've used all of the mentioned glues professionally and privately. My comment is that the rumor of "gap-filling" was a cross-over from expanding foam used in our housework. It is easy to once use the expanding foam, cut it after it has dried to seal the open pores with silicone or other caulk, and view its porosity. This makes for an easy human error of relating Gorilla Glue's texture to that of the expanding foam. And it is an understandable error. Also, if you never test the joint you've used the Gorilla Glue on ("Real Men Don't Need Instructions"") then you have no idea it is weak in certain applications. Narrowly speaking Gorilla Glue is gap-filling, but not a strong bond; so, there is truth in the statement, even if is misunderstood. I'd like to comfort all of us real men who don't need instructions with the knowledge that we were kind of hoodwinked by the linguistics and semantics of our tribe. We are forgiven, as is Matthias for cursing. My repair projects have never worked until in the process I have said swear words once or three times. My wife insists I must "bless" the issue and not curse it. I've tried this, and, well, it didn't make me feel any better than the swear words. Well, once it did. But cussing the #!*^ thing usually seems to work, much to my shame.

  35. Gorilla Glue sux ass. It’s always sucked. I honestly cannot think of a single use for it other than throwing it in the garbage can. Dont ever use it on anything that matters to you.

  36. The first test is not accurate. Wood A was not making contact at all with Wood B. Which resulted in not making a strong bond

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