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Author Topic: Flexible wood glue…  (Read 4130 times)

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Offline Dusty.Tools

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Flexible wood glue…
« on: September 04, 2023, 02:16 AM »
Can anyone recommend a flexible wood glue that can help alleviate vibrations in a moving vehicle? Hide glue looked interesting but it doesn’t appear to be waterproof…

Thanks as always.
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@dusty.tools
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Offline woodferret

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Re: Flexible wood glue…
« Reply #1 on: September 04, 2023, 07:44 AM »
Ideally, mechanical fastener and gasket.  Second, flexible epoxy.  Total boat has one (THIXO), and other brands marine grade (eg permatex h2, etc etc).
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Offline Crazyraceguy

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Re: Flexible wood glue…
« Reply #2 on: September 04, 2023, 07:54 AM »
Depending on what you are trying to attach, you would be surprised by how well pure silicone works.
We use it to secure plywood substrate to solid surface countertops. This allows them to be screwed to the cabinets from below, because you cannot screw directly into it. The slight flexibility allows the solid surface material to expand/contract with temperature changes, yet remain fastened.
Granite and quartz tops are stuck down directly with silicone, no screws at all, but they don't move.
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Offline Steve1

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Re: Flexible wood glue…
« Reply #3 on: September 04, 2023, 08:29 AM »
Do you really need something more flexible than the common PVA glues such as Titebond ?

I have had drips and runs of glue onto my plastic sheet that I put down under a glue-up.  The dried glue is not brittle.   
I assume we are talking about a wood-wood joint.
(Titebond 3 is waterproof) 
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Offline WillAdams

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Re: Flexible wood glue…
« Reply #4 on: September 04, 2023, 09:09 AM »
Titebond 3 is used for backings in archery bows and seems to be just as flexible, if not more so than the wood.

To alleviate vibrations I'd recommend a rubber gasket/washer.
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Online Cheese

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Re: Flexible wood glue…
« Reply #5 on: September 04, 2023, 09:59 AM »
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Offline Packard

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Re: Flexible wood glue…
« Reply #6 on: September 04, 2023, 11:33 AM »
E6000, a styrene based clear and flexible adhesive is like silicone adhesive on steroids. A much stronger hold and just a slightly harder cure.

It is widely used in the costume jewelry industry to “set” inexpensive stones to cheap settings. 

And while it is superb on non porous surfaces, it seems to do better on wood.

I see small tubes at Lowes and Home Depot, and also at Michael’s Hobby and Amazon.  Amazon sells tiny single-use tubes as well as caulking gun compatible tubes.

When silicone adhesive is not strong enough, E6000 is an excellent choice.

Note: The same company also produces “B6000”, which did not perform as well for me and appears to have a very limited shelf life.
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Offline Dusty.Tools

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Re: Flexible wood glue…
« Reply #7 on: September 06, 2023, 12:24 AM »
Thanks all for the great suggestions.

I picked up some Titebond III from HD and did a test piece overnight. I also have silicon glue so I might try that, great idea.

To answer why - a truck going over congregated sand roads in Namibia for 100s miles gets shaken to death. So I am trying at every step to add some flexibility.

I will mount the cabinets using Sika 552, which is very elastic. Then put a strip of neoprene between the wood and wall where there is no glue. This is primarily done to ensure nothing falls down the back of a backless cabinet but also to add some cushioning.
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Offline woodferret

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Re: Flexible wood glue…
« Reply #8 on: September 06, 2023, 10:33 AM »
With that said, bolt.  Sika 552 is a very light adhesive for panel mounting and other very light duty tasks.  It's tensile strength is 3Mpa.

Tensile strength (and bond strength) comes into play during mounting of any object that'll rotate and touch another hard surface.  It'll pivot there and pull against the adhesive, having the greatest pull the furthest away from that pivot.  A tall van cabinet is horrendous.  It's why we have all those anti-tip devices that are bolted in.

To put everything in perspective ...

Titebond bond strength is rated 28MPa.  For reference, stainless A2 bolts are min 500MPa, with class 8.8 bolts being 700MPa.  Engineering silicone can get roughly up to 170MPa (BUT! GE Silicone all purpose comes in at 1.5MPa - not a typo). 

I'm personally already leery of trust A2 bolts for heavy mounting.  Your comfort level may vary.

P.S. Flexible epoxy is usually in the range of 25-30MPa so remove that from my recommendations.
« Last Edit: September 06, 2023, 10:37 AM by woodferret »
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Offline Dusty.Tools

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Re: Flexible wood glue…
« Reply #9 on: September 06, 2023, 11:45 AM »
Quote from: woodferret on September 06, 2023, 10:33 AM
With that said, bolt.  Sika 552 is a very light adhesive for panel mounting and other very light duty tasks.  It's tensile strength is 3Mpa.

Tensile strength (and bond strength) comes into play during mounting of any object that'll rotate and touch another hard surface.  It'll pivot there and pull against the adhesive, having the greatest pull the furthest away from that pivot.  A tall van cabinet is horrendous.  It's why we have all those anti-tip devices that are bolted in.

To put everything in perspective ...

Titebond bond strength is rated 28MPa.  For reference, stainless A2 bolts are min 500MPa, with class 8.8 bolts being 700MPa.  Engineering silicone can get roughly up to 170MPa (BUT! GE Silicone all purpose comes in at 1.5MPa - not a typo). 

I'm personally already leery of trust A2 bolts for heavy mounting.  Your comfort level may vary.

P.S. Flexible epoxy is usually in the range of 25-30MPa so remove that from my recommendations.
Very interesting thanks! You definitely learn something every day.

My whole habitat is built using 552 (manufacturers requirement). But I guess it’s about adhesion, not strength. The panels slot into an Aluminium extrusion.


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Offline Packard

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Re: Flexible wood glue…
« Reply #10 on: September 06, 2023, 02:53 PM »
With the road travel in mind, I might be inclined to add retention straps in case the glue fails.  Much like the hurricane straps, but perhaps nylon webbing would be a better choice than galvanized steel in this instance.


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Offline Dusty.Tools

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Re: Flexible wood glue…
« Reply #11 on: September 06, 2023, 02:59 PM »
Thanks, yeah I agree. I have been planning to use ratch straps, especially around the batteries and water tanks, they are going to be heavy!
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@dusty.tools

Offline Duckler

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Re: Flexible wood glue…
« Reply #12 on: September 17, 2023, 10:24 PM »
Quote from: Dusty.Tools on September 04, 2023, 02:16 AM
Can anyone recommend a flexible wood glue that can help alleviate vibrations in a moving vehicle? Hide glue looked interesting but it doesn’t appear to be waterproof…

Thanks as always.
I think you have some better choices than what has been mentioned so far.
3M makes some great adhesives used to adhere vehicle components. The thixotropic products might come close in performance to 3M products.
3M 5200 is an obvious winner.
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Offline kevinculle

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Re: Flexible wood glue…
« Reply #13 on: September 18, 2023, 07:56 AM »
My preferred choice for a wood glue that is very strong yet flexible, to use in critical joinery is West Marine G-Flex epoxy.  It's widely available including at Amazon, not inexpensive at about $30 for two 4.5 fl oz (118mL) bottles.  It mixes 1:1 to an amber color and cures in about 8 hours.  I often use a plant grow light to heat the joint area to about 150 degrees F (66 degrees C) which both speeds curing to an hour or so and provides improved strength characteristics.
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Online Cheese

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Re: Flexible wood glue…
« Reply #14 on: September 18, 2023, 10:23 AM »
Quote from: Duckler on September 17, 2023, 10:24 PM
I think you have some better choices than what has been mentioned so far.
3M makes some great adhesives used to adhere vehicle components. The thixotropic products might come close in performance to 3M products.
3M 5200 is an obvious winner.

Just to expand on Duckler's information, 3M manufactures products for automotive panel bonding which may be a similar application to what you're doing.









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