Thin Titebond II to glue rigid foam to plywood?

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Thin Titebond II to glue rigid foam to plywood?

Postby JamesDixonLR » Fri May 18, 2018 6:24 pm

I expect this has been asked and answered but I couldn't find one. I've got Foamular that I will be using in plywood sandwiches. Should I thin the glue with water to spread more easily as was discussed for canvas a week or so ago? That discussion said 50/50 water to glue for the canvas skin. thanks
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Re: Thin Titebond II to glue rigid foam to plywood?

Postby Sparksalot » Fri May 18, 2018 6:28 pm

I glued rigid foam to plywood in Rose using unthinned Titebond.
Holy cow, Rose is a teenager now! Done? Surely you jest. A teardrop is never "done".

The Compass Rose build thread: viewtopic.php?t=23213

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Re: Thin Titebond II to glue rigid foam to plywood?

Postby John61CT » Sat May 19, 2018 7:45 am

The thinning is to allow penetration / soaking into the canvas.

It does not help, only hurts adhesion strength. NBD for the canvas application, but not a good idea IMO for any other where more strength is required.

IOW, for maximum strength with TB, unthinned is best.

______
Glidden Gripper gets rave reviews for laminating sheets, wood to foam.

Roughing up the foam to take off the factory release layer, even putting in a lot of small holes with a spiky roller,

combined with an even stronger glue would be, well, even stronger.

Gorilla Glue Construction adhesive may well be overkill for laminating sheets, but apparently is the strongest adhesive for foam-to-foam, and especially useful at stressed edges and corners.
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Re: Thin Titebond II to glue rigid foam to plywood?

Postby JamesDixonLR » Sat May 19, 2018 9:21 am

I've been wondering if Glidden Gripper would work for that purpose, adhering plywood to the Foamular. It would be easier to spread for sure.
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Re: Thin Titebond II to glue rigid foam to plywood?

Postby John61CT » Sat May 19, 2018 11:52 am

Absolutely, my understanding from many threads here more effectively than TB.

Just a little more expensive.
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Re: Thin Titebond II to glue rigid foam to plywood?

Postby GPW » Sun May 20, 2018 5:15 am

Just remember no matter what glue you use, the Foam is still the weakest part of the equation … The foam will always fail first …
There’s no place like Foam !
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Re: Thin Titebond II to glue rigid foam to plywood?

Postby QueticoBill » Sun May 20, 2018 10:17 am

That would be fail first in tension on the joint, correct?
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Re: Thin Titebond II to glue rigid foam to plywood?

Postby tony.latham » Sun May 20, 2018 10:39 am

From Tightbond:

Can Titebond Wood Glues be thinned?
Most of our water-based wood glues can be thinned with water up to 5% by weight or by volume. Adding more than 5% water to our glues will decrease the bond strength.


I wouldn't thin it. Just use a squeegee to move it around.

T
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Re: Thin Titebond II to glue rigid foam to plywood?

Postby JamesDixonLR » Sun May 20, 2018 4:30 pm

The consensus is no thinning of the glue. In fact, the idea of scoring the foam with a carpet seam roller and then spreading Glidden Gripper on both surfaces is very appealing. Seems like the best idea. thanks
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Re: Thin Titebond II to glue rigid foam to plywood?

Postby John61CT » Sun May 20, 2018 7:38 pm

Isn't there a spiked roller that penetrates the foam more deeply?
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Re: Thin Titebond II to glue rigid foam to plywood?

Postby JamesDixonLR » Mon May 21, 2018 4:59 am

This is what I ordered off, except from Ebay. It will be here in a few days, about the time I'm ready for it.
https://www.homedepot.com/p/Roberts-4-in-Star-Wheel-Pro-Carpet-Seam-Roller-10-169/202205731
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Re: Thin Titebond II to glue rigid foam to plywood?

Postby pchast » Mon May 21, 2018 10:45 pm

https://www.amazon.com/Warner-250-Tool- ... 02&sr=8-49

This is what I used. The spikes were about 5/16" on th e one I got.
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Re: Thin Titebond II to glue rigid foam to plywood?

Postby OP827 » Tue May 22, 2018 6:30 pm

If you are gluing large sandwich panels like I did with my build, you may find that TB2 is drying too fast, i.e. before you can completely clamp the sandwich. After doing first panel with TB2 I changed to epoxy and then to PL premium(less cost) due to much more working time(less stress) than TB2.
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Re: Thin Titebond II to glue rigid foam to plywood?

Postby earl84 » Sun May 27, 2018 10:21 pm

I did a very non-scientific test bonding foam to wood. I used TB2, epoxy, and PL Premium. PL Premium was by far the strongest bond, TB2 was next, then epoxy. It was super simple to do, didn’t cost anything hardly, and convinced me how I was going to build. I’d recommend you do the same and answer your own question.
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